Diversity is essential to happiness and in Utopia there is hardly any. This is a defect in all planned social systems.

When it was first proposed to establish laboratories at Cambridge, Todhunter, the mathematician, objected that it was unnecessary for students to see experiments performed, since the results could be vouched for by their teachers, all of them of the highest character, and many of them clergymen of the Church of England.

The fact that a belief has a good moral effect upon a man is no evidence whatsoever in favor of its truth. I'm not contending in a dogmatic way that there is not a God. What I'm contending is that we don't know that there is. I don't like the word "absolute." I don't think there is anything absolute whatever. The moral law, for example, is always changing. At one period in the development of the human race, almost everybody thought cannibalism was a duty.

Ethical metaphysics is fundamentally an attempt, however disguised, to give legislative force to our own wishes.

I am firm; YOU are obstinate; HE is a pig-headed fool.

Most political leaders acquire their position by causing large numbers of people to believe that these leaders are actuated by altruistic desires

Philosophy is that part of science which at present people chose to have opinions about, but which they have no knowledge about. Therefore every advance in knowledge robs philosophy of some problems which formerly it had ...and will belong to science.