With most men, unbelief in one thing springs from blind belief in another.

It is a question whether, when we break a murderer on the wheel, we do not fall into the error a child makes when it hits the chair it has bumped into.

A good method of discovery is to imagine certain members of a system removed and then see how what is left would behave: for example, where would we be if iron were absent from the world: this is an old example.

If you are going to build something in the air it is always better to build castles than houses of cards.

Even truth needs to be clad in new garments if it is to appeal to a new age.

What a blessing it would be if we could open and shut our ears...as easily as we open and shut our eyes.

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?