The thinking person has the strange characteristic to like to create a fantasy in the place of the unsolved problem, a fantasy that stays with the person even when the problem has been solved and truth made its appearance.

The credit of advancing science has always been due to individuals and never to the age.

Where I cannot be moral, my power is gone.

Properly speaking, such work is never finished; one must declare it so when, according to time and circumstances, one has done one's best.

In the realm of ideas everything depends on enthusiasm... in the real world all rests on perseverance.

He who is and remains true to himself and to others has the most attractive quality of the greatest talent.

It is a mistake for a taciturn, serious-minded woman to marry a jovial man, but not for a serious-minded man to marry a lighthearted woman.