Without my attempts in natural science, I should never have learned to know mankind such as it is. In nothing else can we so closely approach pure contemplation and thought, so closely observe the errors of the senses and of the understanding, the weak and strong points of character.

I treat my heart like a sick child and gratify its every fancy

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

Life is too short to drink bad wine.

Behavior is the mirror in which everyone shows their image.

I am very anxious to please the public, particularly as it lives and lets live.

Every reader, if he has a strong mind, reads himself into the book, and amalgamates his thoughts with those of the author.