Self-awareness is literally
consciousness of one's self. It is related to but not identical with
self-consciousness[1]"...And as I observed that this truth 'I think, therefore I am' (Cogito ergo sum) was so certain and of such evidence ...I concluded that I might, without scruple, accept it as the first principle of the Philosophy I was in search."
"...In the statement 'I think, therefore I am' ...I see very clearly that to think it is necessary to be, I concluded that I might take, as a general rule, the principle, that all the things which we very clearly and distinctly conceive are true..."[2][3]
While reading Descartes, Locke began to relish the great ideas of philosophy and the scientific method. On one occasion, while in a meeting with friends, the question of the "limits of human understanding" arose. He spent almost twenty years of his life on the subject until the publication of An Essay Concerning Human Understanding, a great chapter in the History of Philosophy.[4]