Time is a great teacher, but unfortunately it kills all its pupils. Hector Berlioz It is easier to fight for one's principles than to live up to them.

The only worthwhile achievements of man are those which are socially useful.

My psychology belongs to everyone.

Each generation has its few great mathematicians, and mathematics would not even notice the absence of the others. They are useful as teachers, and their research harms no one, but it is of no importance at all. A mathematician is great or he is nothing.

It is the patriotic duty of every man to lie for his country.

The educator must believe in the potential power of his pupil, and he must employ all his art in seeking to bring his pupil to experience this power.

In a country of such recent civilization as ours, whose almost limitless treasures of material wealth invite the risks of capital and the industry of labor, it is but natural that material interests should absorb the attention of the people to a degree elsewhere unknown.