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The most difficult thing in life is to know yourself.

I think self-knowledge is the rarest trait in a human being.

The one self-knowledge worth having is to know one's own mind.

I really do feel like I know myself, and I'm so happy to be by myself and I'm so happy to be with other people; I just know myself really, really well, and I think that is an amazing thing. I think a lot of people don't know themselves that well.

In truth, to know oneself seems to be the hardest of all things. Not only our eye, which observes external objects, does not use the sense of sight upon itself, but even our mind, which contemplates intently another's sin, is slow in the recognition of its own defects.

Knowledge of the self is the mother of all knowledge. So it is incumbent on me to know my self, to know it completely, to know its minutiae, its characteristics, its subtleties, and its very atoms.

I've always been a very self-aware person.

Personally, people know themselves very poorly.

To know oneself is to disbelieve utopia.

I think a lot of self-importance is a product of fear. And fear, living in sort of an un-self-examined fear-based life, tends to lead to narcissism and self-importance.