in other words: learning logic.
(EDIT: sry I personally call all that just logic)
IMHO it's essential for a clear understanding of what you think you understand. This is the tool if you want to elevate your Ti thinking to a conscious level, so you know wth is happening when you think certain things. and maybe even more importantly: so you know your limits. logic is the function of the brain like filtering blood is the function of the liver, so it makes sence to learn logic, like a manual to your brain.
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) conciousness and self awareness alone is not enough if you want to build complex models of what you perceive as reality. you will be forced to constantly reworking them with your Ti untill finally reinventing a subset of model theory anyway, heh, so why not do it in the first place, right? and spare yourself a lot of time
for example, the very reason I believe people that are good programmers and fast learners in abstract fields are so because of personally and tediously reinventing model theory
(reinventing the wheel so to speak), or having it forced upon them in college or wherever and understood its implications on our minds. I however do not believe the mathematic notations are always intuitive. You need to build your own intuitive/personal/deep/clear understanding of the concepts. which means: I'm not necessarily proposing to learn model theory's notation and terminology. It's the concepts behind all that that are essential
(well that should be obvious)