Nothing leads the scientist so astray as a premature truth.

It is sometimes well for a blatant error to draw attention to overmodest truths.

Stupidity, outrage, vanity, cruelty, iniquity, bad faith, falsehood - we fail to see the whole array when it is facing in the same direction as we.

The biologist passes. The frog stays the same.

I think I am one of those who can manage not to take on a completely different appearance under their own glance.

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

A man is not old as long as he is seeking something.