If you wish to be happy yourself, you must resign yourself to seeing others also happy.

On the one hand, philosophy is to keep us thinking about things that we may come to know, and on the other hand to keep us modestly aware of how much that seems like knowledge isn't knowledge

Artists are on the average less happy than men of science.

So far I have been speaking of theoretical science, which is an attempt to understand the world. Practical science, which is an attempt to change the world, has been important from the first, and has continually increased in importance, until it has almost ousted theoretical science from men's thoughts.

If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking as you do.

You are a wicked motorcar, and I shall not give you any more petrol until you go.

No great achievement is possible without persistent work.