Everyone should study at least enough philosophy and belles-lettres to make his sexual experience more delectable.

Why does a suppurating lung give so little warning and a sore on the finger so much?

Ambition and suspicion always go together.

Astronomy is perhaps the science whose discoveries owe least to chance, in which human understanding appears in its whole magnitude, and through which man can best learn how small he is.

Everyone is a genius at least once a year.

There were honest people long before there were Christians and there are, God be praised, still honest people where there are no Christians. It could therefore easily be possible that people are Christians because true Christianity corresponds to what they would have been even if Christianity did not exist.

Nothing makes one old so quickly as the ever-present thought that one is growing older.