Orthodoxy is the grave of intelligence, no matter what orthodoxy it may be.
The rules of logic are to mathematics what those of structure are to architecture.
Why repeat the old errors, if there are so many new errors to commit?
Human nature is so constructed that it gives affection most readily to those who seem least to demand it.
The wise man will be as happy as circumstances permit, and if he finds the contemplation of the universe painful beyond a point, he will contemplate something else instead.
Few people can be happy unless they hate some other person, nation, or creed.