“Humble people know their limitations: they know what they know, and they know what they do not know; they know what they can do or be, and they know what they cannot do or be”

“People know what they do; frequently they know why they do what they do; but what they don't know is what what they do does.”

“People know what they do; they frequently know why they do what they do; but what they don’t know is what what they do does.”

“To know that we know what we know, and to know that we do not know what we do not know, that is true knowledge.”

“To know that we know what we know, and that we do not know what we do not know, that is true knowledge.”

“Knowing yourself means knowing, first, what it is to be a person; secondly, knowing what it is to be the kind of person you are; and thirdly, knowing what it is to be the person you are and nobody else is. Knowing yourself means knowing what you can do; and since nobody knows what they can do until they try, The only clue to what man can do is what man has done. The value of history, then, is that it teaches us what man has done and thus what man is.”