Part I:
Epistemology
Introduction
Philosophy must begin in epistemology. Without a framework for evaluating beliefs, judging plausibility and probability of beliefs, and standardizing the laws of justifications, anyone can argue for anything. However, even epistemology is controversial. Which epistemology do we use to select an epistemology? Do we need a meta-epistemology? This would lead to an infinite regress of meta-meta-meta....epistemology. But then people can choose their own personal epistemology and start with it and argue for anything. In my observation, even if people follows some common principles in selecting epistemic norms, subtle differences can still lead to irreconcilably different conclusions (at least irreconcilable as long as the initial epistemic premises are maintained to be different). What are we to do now? Well we have to start somewhere, and I guess, I am going to start with whatever seems best to me at the moment.
Search for First Principle: Methodological Doubt
One of the most promising epistemic start was begun by Descartes - the father of modern philosophy. As we all know, Descartes used a principled method of doubt - methodological doubt - in order to search for the first principle or the foundation for certain knowledge. He noticed that he believed in lot of things that he have later come to doubt. How is he to know that now too he isn't holding false beliefs? He wanted to find the principle that justifies certainty. In order to do so he doubted everything that can be doubted, so that he may discover that which can't be doubted. Once that is discovered, Descartes had to simply check what is special about this - the principle that makes it certain. After that he planned to use that principle to justify other potential beliefs.
What can be doubted? Well, what not? There are always mundane skeptical arguments. Often what seemed to be isn't so. We can doubt our senses and such. And keep on going. We can doubt if we are all in a dream. Some may argue that a dream is always unclear, inconsistent and all that. But -
1) Why should one believe that dreams has to necessarily lack vividity. Some dreams can be quite vivid, even if not as vivid as 'real life'. But who is to say there is limit to 'vividity' that can be present in a dream? Similarly, there is no justification is presupposing that dreams necessarily have to be ordered, consistent, with regularities and everything.
2) Regardless of how ordered or vivid dreams are, if all of your dreams aren't lucid, then clearly you lack the epistemic ability to distinguish dream and reality in all circumstances. So no matter how reliable you think your intuition is that says 'this is real; not a dream', experiences and memories prove that it isn't that reliable at all.
(There are also modern variants of skeptical hypotheses - Boltzmann brain, BIV, simulation etc.)
There are some arguments against external-world skepticism, but most of them are flawed or unconvincing - or at best makes it sound implausible, but almost never impossible.
But even in a dream, it would seem that there are elements of knowledge - principles of geometry, maths, and logic, for example.
However, if we summon Descartes' Demon we can undermine everything. Descartes' Demon can not only systematically deceive your senses, but He can even manipulate your thoughts, feelings, intuitions and everything. That is, even the simplest logical principles that seems to make so much sense - that seems to be certainly true and even necessarily true may be simply what the Demon is making you think.
(While Descartes' Demon is extreme, I myself personally have been in situation analogous to it. In the realm between dreaming consciousness and waking-consciousness or even in dream-consciousness, a lot of nonsensical analogies, or absurd associations between concepts sometimes make sense - which again makes barely any sense as soon as I become slightly more alert. But if the nonsense can appear as sensible depending on which mode of consciousness one is in, how can I know that right now I am not in such a mode? If that is the case, even thoughts on basic logic, maths, and everything can be doubted.)
How does one get out of that?
Before proceeding further with methodological doubt, we have to ask if this path is even worth the travel. Surely there had been numerous criticism against the method itself.
Is there any hope?
CS Pierce, Hume, and others have questioned methodological doubt itself. We all are hopelessly mired in prejudices. Our doubts and everything may also be bound by our prejudices. We can't ever hope to start from a blank epistemic state, but if not, then our prior unjustified conceptions may misdirect our thoughts away from the Truth no matter what we try. How do we know that won't happen? Hume, on the other hand, argued that if we are willing to doubt our basic cognitive abilities itself to the point of doubting our sanity and ability for basic reasoning, there is no way out. Surely, where do we even go now after summoning Descartes' demon? We can't reason ourselves out; because it is the very principles of reasoning that are put to question after the summoning. We won't even know if language means anything, or if we are even doubting coherently. And if even logic is wrong, what can be known? Even if I exist it may mean that I don't exist. Even if I know nothing it can mean I know anything and everything. When all principles are abandoned, all hopes for first principles are extinguished.
So, now what? Again, we have to just start with what we can. I will just go on what seems best to me at the moment. And what seems best?
Common-sense epistemology? Lol, no. 'Common sense' is ok, but a bit too wishy-washy. As Einstein said, common sense is a collection of prejudices or something. 'Common sense epistemology' has its place, but not right now, not right here. Even now, the best way to go seems to me to be the plain ol' methodological doubt. With this we can push everything to its limits - and at least find the beliefs that are hardest to doubt coherently.
Approximated First Principle
And I have already found my first principle - the principle of epistemology that I am going to use to structure beliefs in a hierarchy.
The beliefs that are hardest to doubt coherently will become the initial foundations. Beliefs that seem extremely implausible and slightly less hard to doubt coherently will be ranked higher. Based on the lower ranked and higher ranked beliefs, new beliefs may be derived.
My position may even draw some insights from Wittgenstein's "On Certainty". One point that was established there, is that the more skeptical we become the more incoherent the doubt starts to become. Even doubt itself presupposes implicitly the linguistic-sociological context in which the very concept of doubt has emerged. At certain level, one can continue doubting surely, but one's doubt becomes "beyond reasonable".
So it seems like a good heuristic to accept those beliefs that are almost impossible to reasonably doubt.
Now what is it that is hardest to doubt?
Since there seems to be no way out of a Strong Descartes Demon, let's use a Weak Descartes' Demon who can systematically decieve you in just about anything except some basic stuffs- what are those which are hardest to be deceived about?
In this regards, I must agree with Descartes, it is "I am".
To doubt my existence is to only affirm the existence of 'doubting' (the doubter).
Descartes surely was not the first one to think this. This idea roots back to the ancient Indians. To doubt consciousness is to affirm consciousness.
Nevertheless, Descartes' "cogito ergo sum" have been criticized again and again, in various manner.
Laymen are quick to point out "I think therefore I am" already presupposes the existence of "I" therefore it's circular. However, it is not about the logical form. To understand the meaning one have to understand the context. The point here is that the existence of I - the self is so fundamental that one cannot even doubt it without proving it in the very act of doubting. This may not counter Strong Descartes Demon which is even difficult to conceive or entertain, but in any case, it seems beyond all reasonable doubt to exist.
Furthermore, Descartes, in his meditations, didn't even say "I think therefore I am" in that form.
However, the Cartesian Ego has still been endlessly criticized by many philosophers. Now, we shouldn't get too far ahead of ourselves. At this point we haven't really clarified what this "I" is. At this point it's meaning is minimal - it doesn't have to anything but this experience. It need not be anything other than the mere thought. It merely just have to be 'being'. Charitably, we can believe that Descartes' initial conception was similar too. Only later he started to flesh it out - at which point he may have over-inflated it.
Following Descartes, I shall choose it to be my first foundation (approximate).
Before moving on, I must acknowledge certain principles. Law of identity and Law of non-contradiction; may be even Law of Excluded Middle (we shall see). Generally, deductive principles. Am I justified in doing so? It seems like it. They seem true by virtue of being pretty much vacuous.
To say X is to say X (identity). If X exists, then that X must not not exist (non-contradiction). And so on.
With identity, it seems I can derive a bit of math too,
First Unary Mathematics:
Addition will be conceiving to 1 together. I will use space as addition operator
1=1
1 1 = 1 1
1 1 1 1 = 1 1 1 1
Now, let us represent 1 1 as 2. And 1 1 1 1 as 4
Thus we get 1 1 1 1 = 1 1 1 1 => 2 2 = 4. Now instead of space let us use "+"
2+2=4.
Similarly, I can derive subtraction.
From repeated addition, I can get multiplication. From repeated multiplication and a bit of syntactic sugar, I can get exponents and so on and so forth.
Now the relationship between logic and mathematics are a bit complicated. Logism - the idea that math is founded in logic failed sometime ago (Thanks Godel).
Mathematics can get a bit messy - almost like an empirical discipline as Quine argued. Anyway, I am getting too ahead of myself. Let's get back to basic logic.
Am I justified in using basic logic?
Well, it's seems hard to not use it. All the while I am somewhat implicitly presuppossing it. I have making implicit and explicit arguments and interpretations while trying to maintaining an overall consistency - and consistency requires avoiding law of non-contradiction.
It's hard to imagine what a true contradiction may even be.
Contradictions mostly seems to appear in language when something is wrong or false. Most cases of true contradictions seem to exist in case when contradictions are loosely conceived.
However, one thing to note is that there is a beast called paraconsistent logic - in which absolute consistency may not be consistently maintained. That is, it can allow true contradictions. But even that tries to constrain the explosive principle (following which anything can be proved given a true contradiction), and constrain true contradictions to certain things. Most often these have to do with trickiness of language, and expression.
Mathematics is still a close by discipline to logic whether one is a logicist or not. But even in mathematics there can be overlooked presuppositions, problematic axioms and stuffs - that may not be 'self-evident'. (For example Russell's Paradox showed the weird implications of classical set theory, and all that).
After all we are humans. But then how much can we trust. Where do we draw the line and say "this principles are certain", and "these aren't".
Even if we accept the principles, there is another manner in which we can be skeptical.
May be I have the correct logical and mathematical principles, but while going to a conclusion from a set of premises I may make a mistake somewhere along the line.
How do I know I wouldn't? I can check. But I can again overlook something or make a mistake while checking. Then should I re-check? But this can go on to infinity. I already have a very bad tendency for silly mistakes.
May be we can at least be sure of simple use cases. But again where do we draw the line?
Also if we take paraconsistent logic seriously, then it may still put to doubt to what extent we can use the fundamental principles of classical logic and stuffs that we have come to be familiar with.
There are also disputes with intuitive ideas like Law of Excluded Middle.
Not only there seems to be a general confusion as to which principles we should follow, but even if we choose some principles we can always be mistaken in using it.
Again we are stuck in a wall.
Again, we must compromise. We have to start somewhere.
I shall assume the basic laws of deduction and move on.
I would still rank laws of deduction almost as high as "I am".
Because if they aren't true to some level, I can't even establish "I am". Because "I am" can then also mean "I am absolutely not".
It is really as hard to doubt deductive principles as "I am". We can accept that at the limits of expressions things can get a bit messy, and move on for now. On the same note, let's also accept basic arithmetic and mathematics. We may discuss more on them later.
But now that we have deductive principles, we can derive new beliefs by using pre-established beliefs using deduction. Though all derivation can do is make the implicit explicit.
One interesting principle is of modality.
Something can be thought to be necessarily true if it seems logically necessary. Something is logically necessary when its negation is a contradiction. It follows from acceptance of deductive principles, that if negating something implies a contradiction, then that something must be held as necessarily true.
Similarly then, if we can conceive of alternate non-contradictory possibilities of some proposition P, then it would mean P isn't logically necessary, and other possibilities can be true (or at least not logically necessitated to be false). Absence of any strong evidence, logical possibilities may as well be taken as possibilities epistemically.
Now, standardly, often logic is thought of as purely in a syntactic manner where the symbols could be meant to mean anything. So "bachelors are married" in that sense may not be logically impossible because bachelors and married are here simply symbols "X are Z" - so there is no formal contradiction in the form itself (not like X and NOT-X).
But I am here speaking of logic in a more semantic sense - where standard meanings of symbols are considered. In this case, "bachelors are married" will be considered logically impossible.
Metaphysical possibility is also a similar concept, but there is the notion of 'rigid designation' which makes things complicated a bit. IMO, these are all matters of semantics - about which vocabulary and in which sense you choose to use. So I will not go too deep into this here.
Now, I will introduce the notion of Epistemic Possibility.
X is epistemically possible if
It is seemingly logically consistent with all my beliefs (that I have established)
This is the definition I will use for epistemic possibility (it may be slightly non-standard)
I may as well introduce "Epistemic Necessity":
X is epistemically necessary if
It is seemingly logically necessitated by my beliefs (that I have established)
Note: Epistemically Possible something may not really be logically consistent - but it would at least seem (to me) to be logically consistent.
Same for epistemic necessity.
Using these principles I can explore, possibilities and necessities.
Since I have accepted deduction, I should accept beliefs that seem to deductively follow from my other beliefs.
And on the same note, I should be aware of accepting any belief with too high of a degree of confidence, if alternative possibilities appear epistemically possible to me.
These principles can now provide me some guidelines to investigate the world.
But what should I investigate?
Since I started with "I am", it makes most sense to start investigating with the "I am".
But where should I investigate " I am ".
The best starting point, seems to be, phenomenology - the world of appearances.
Before I start with phenomenology, let me flesh out the overall epistemological framework I am going to use.
Based on the degree of doubt-ability I will rank beliefs in a hierarchy as described.
Let's say - lower the rank more 'fundamental' the beliefs are to be considered.
But because of all the possibility of error, and inescapable prejudices in thoughts and language, I will take an anti-foundationalist stance in that everything will be kept open to revision.
And when shall we revise:
If a hard to doubt belief is contradicted by something derived by even hard to hard beliefs - then I have to abandon the contradicted belief no matter how common-sensical or intuitive it is. Which is why I won't be blindly starting from 'common sense' epistemology presupposing that all the "common sense facts" add up or that they are totally compatible with each other. Also, considering that I don't find myself to be sharing much of the commonly shared common sense regarding many things, I don't see it as that good of a foundation to start epistemology.
Sometimes, I may also have to question some of the most hard to doubt beliefs, if a lot of less hard to doubt beliefs (or derivatives of such) provides evidence against some of those most hard to doubt beliefs. Here can be quantity vs quality trade-off. I don't have a precise formulation to approach these cases yet. We shall see if we ever come across an actual example.
Phenomenology
Phenomenology is the study of first person experiences. For me, it's the study of appearances and its structure. What do I mean by appearances?
Well, it's hard to describe without circularity. Basically all that appears right now, in whatever form (visual, auditory, cognitive etc.).
I may also call them as phenomenal appearance - something is phenomenal if there is 'something it is like' - or 'there is some quality/likeness in it'.
I avoided using "something it is like to BE', because it can cause certain misunderstandings....or something I don't know.
It is through phenomenality that I discover being. And it is this being which I claimed as "I am".
Therefore, phenomenality is the source of one of my most foundational (even if provisional) belief.
Then why not look into it deeper? Before, digging too deep, I must again try to be cautious and try to doubt appearance itself - how reliable can it be? Should I really hold the source at such high regard?
Can a phenomenal appearance ever be 'false'?
It seems, in a sense, appearance is simply appearance. It doesn't 'claim' any reality beyond it being 'appearance'. A false appearance still has to be a true appearance as an appearance. While appearances may misrepresent things, like make the same color appear differently owing to distorted cognition - the misrepresentations are still appearances. It is not wrong when I am suspending myself from saying anything about it much more than "it appears to me as such". Would I be wrong in saying I know "the two colors appears to me as different" (it doesn't contradict the fact that they are actually same. So if claims are constrained only to the realm of appearances, it seem they will rarely ever be false).
It can't be the case that I think something to appear as X, when it actually appear as Y, because, the 'thinking' itself is appearance.
As some philosophers say, when it comes to appearance there is no gap between illusion and reality.
But, there are also others who question the appearance of appearance itself. Is appearance then something we can doubt to even exist at all? What reasons can there be to question existence of any form of appearance itself?
Normally, if something is an illusory, we say "it only appears to you to be like X, when it is in fact Y". Illusion is distorted appearance of reality, as one may say.
But what about when one say appearance itself is an illusion. One cannot anymore claim "It only appears to you that appearance exist, when appearance doesn't exist" - because that would be a contradiction.
How can then appearance be ever an illusion?
And how can someone sane even doubt appearance?
Before analyzing appearance, I need to do the insane. I must question the existence of appearance itself. I must try to follow the absurd reasoning - and see if there is any sense at all in it.