He who knows all the answers has not been asked all the questions.

I do not enlighten those who are not eager to learn, nor arouse those who are not anxious to give an explanation themselves. If I have presented one corner of the square and they cannot come back to me with the other three, I should not go over the points again.

The beginning of wisdom is to call things by their proper name.

A man may not transgress the bounds of major morals, but may make errors in minor morals.

Not to alter one's faults is to be faulty indeed.

Virtue is more to man than either water or fire. I have seen men die from treading on water and fire, but I have never seen a man die from treading the course of virtue.

A youth is to be regarded with respect. How do we know that his future will not be equal to our present?