Great men too make mistakes, and many among them do it so often that one is almost tempted to call them little men.

A book is a mirror: if an ape looks into it an apostle is hardly likely to look out.

Do not judge God's world from your own. Trim your own hedge as you wish and plant your flowers in the patterns you can understand, but do not judge the garden of nature from your little window box.

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?

If all mankind were suddenly to practice honesty, many thousands of people would be sure to starve.

One of the greatest creations of the human mind is the art of reviewing books without having read them.

God creates the animals, man creates himself.