I cannot escape from the conclusion that the great ages of progress have depended upon a small number of individuals of transcendent ability.

It has become a commonplace that aggressiveness also often has its roots in fear. I am inclined to think that this theory has been pushed too far. [...] The type of aggressiveness that is the outcome of timidity is not, I think, that which inspires great leaders; the great leaders, I should say, have an exceptional self-confidence which is not only on the surface, but penetrates deep into the subconscious.

Either man will abolish war, or war will abolish man.

More important than the curriculum is the question of the methods of teaching and the spirit in which the teaching is given

A million million years gives us some time to prepare for the end . . . let us make the best of it.

[There has been] every kind of cruelty practiced upon all sorts of people in the name of religion.

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