To be adult is to be alone.
Beauty in art is often nothing but ugliness subdued.
Falsity cannot keep an idea from being beautiful; there are certain errors of such ingenuity that one could regret their not ranking among the achievements of the human mind.
The biologist passes. The frog stays the same.
The nobility of a human being is strictly independent of that of his convictions.
Nothing leads the scientist so astray as a premature truth.