The effectiveness of work increases according to geometric progression if there are no interruptions.

People are what you make them. A scornful look turns into a complete fool a man of average intelligence. A contemptuous indifference turns into an enemy a woman who, well treated, might have been an angel.

There are deserts in every life, and the desert must be depicted if we are to give a fair and complete idea of the country.

The minds of different generations are as impenetrable one by the other as are the monads of Leibniz.

An old man, having retired from active life, regains the gaity and irresponsibility of childhood. He is ready to play, he cannot run with his son, but he can totter with his grandson. Our first and last steps have the same rhythm.

It is better to teach a few things perfectly than many things indifferently...

A man cannot free himself from the past more easily than he can from his own body.