The fruits of philosophy are the important thing, not the philosophy itself. When we ask the time, we don't want to know how watches are made.

Delicacy in woman is strength.

We now possess four principles of morality: 1) a philosophical: do good for its own sake, out of respect for the law; 2) a religious: do good because it is God's will, out of love of God; 3) a human: do good because it will promote your happiness, out of self-love; 4) a political: do good because it will promote the welfare of the society of which you are a part, out of love of society having regard to yourself. But is this not all one single principle, only viewed from different sides?

Some theories are good for nothing except to be argued about.

We cannot remember too often that when we observe nature, and especially the ordering of nature, it is always ourselves alone we are observing.

A vacuum of ideas affects people differently than a vacuum of air, otherwise readers of books would be constantly collapsing.

A handful of soldiers is always better than a mouthful of arguments.