Hmmm, there is a lot of relevant scripture in Ecclesiastics...
Ecclesiatics 1: 16 ...my heart had great experience of wisdom and knowledge.
17 And I gave my heart to know wisdom, and to know madness and folly: I perceived that this also is vexation of spirit.
18 For in much wisdom is much grief: and he that increaseth knowledge increaseth sorrow.
It is simply a matter of experiences, life is. A problem with thought is that it is just one kind of experience, one state of consciousness amongst many. Sometimes the challenge of thought is simply a matter of finding the right words, in which thoughts can be expressed and shared. It may well be that every has "great" thoughts on occasion, but it is only rare individuals who have the ability to translate those thoughts into words and symbols that retain the "essence" of 'greatness".
At one point of my life I was a slave to words, words were my god. I had faith in words. Words dominated my consciousness. I could not shut of the stream of word/thoughts in my mind and still retain consciousness. However, I was finally able to shut off that particular stream of consciousness and now words appear in my head only by invitation.... It seems as though I understand the utility of words better, now that I am no longer chained to them. Also, being free from words has allowed me to experience the joy and lightness of Being you spoke of.. There is a certain joy in Life, beyond the barrier of word. Experience beyond description..., beyond definitions,... beyond reductionism
States of mind/consciousness seem to have a direct correlation with states of being and I believe that the great thinkers that one admires were not humans limited to one state of being, that one dominated by symbols, but were able, as least temporarily, to experience a different state of being which provided enlightenment of one form or another that they were able to form into derivatives/representations and then translate into symbols that had a common meaning.
That is to say I believe that those who are able to take their own unique experiences of life and thought and somehow are able to share those experiences, and in the process make a common experience from that which unique, have accomplished that which one seems compelled to achieve...
LOL I could have just answered your question with a "Yes"...