In their hearts women think that it is men's business to earn money and theirs to spend it.

A hedge between keeps friendship green.

It is a wise thing to be polite; consequently, it is a stupid thing to be rude. To make enemies by unnecessary and willful incivility, is just as insane a proceeding as to set your house on fire. For politeness is like a counter--an avowedly false coin, with which it is foolish to be stingy.

To desire immortality for the individual is really the same as wanting to perpetuate an error forever.

It is difficult to find happiness within oneself, but it is impossible to find it anywhere else.

He who writes carelessly confesses thereby at the very outset that he does not attach much importance to his own thoughts.

The fourfold root of the principle of sufficent reason is "Anything perceived has a cause. All conclusions have premises. All effects have causes. All actions have motives.