What the world needs is not dogma but an attitude of scientific inquiry.

The life of man is a long march through the night, surrounded by invisible foes, tortured by weariness and pain, towards a goal that few can hope to reach, and where none may tarry long.

Against my will, in the course of my travels, the belief that everything worth knowing was known at Cambridge gradually wore off. In this respect my travels were very useful to me.

Speaking psycho-analytically, it may be laid down that any "great ideal" which people mention with awe is really an excuse for inflicting pain on their enemies. Good wine needs no bush, and good morals need no bated breath.

Our individual life is brief, and perhaps the whole life of mankind will be brief if measured in astronomical scale

There is no nonsense so errant that it cannot be made the creed of the vast majority by adequate governmental action.

Language serves not only to express thought but to make possible thoughts which could not exist without it.