Marriage simplifies life and complicates the day.

The nobility of a human being is strictly independent of that of his convictions.

In order to remain true to oneself one ought to renounce one's party three times a day.

We must watch over our modesty in the presence of those who cannot understand its grounds.

When I was young I pitied the old. Now old, it is the young I pity.

It is horrible to see everything that one detested in the past coming back wearing the colors of the future.

A body of work such as Pasteur's is inconceivable in our time: no man would be given a chance to create a whole science. Nowadays a path is scarcely opened up when the crowd begins to pour in.