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.

Study the past if you want to define the future.

Who contains himself goes seldom wrong.

A common man marvels at uncommon things. A wise man marvels at the commonplace.

The green reed which bends in the wind is stronger than the mighty oak which breaks in a storm.

The strongest memory is not as strong as the weakest ink.

The only people who cannot change are the most wise and the most stupid.