I am delighted to know that Principia Mathematica can now be done by machinery. . . I am quite willing to believe that anything in deductive logic can be done by machinery.

All the conditions of happiness are realized in the life of the man of science.

If the State does not acquire supremacy over [vast private] enterprises, it becomes their puppet, and they become the real State.

No man can be a good teacher unless he has feelings of warm affection toward his pupils and a genuine desire to impart to them what he believes to be of value.

Boredom is... a vital problem for the moralist, since half the sins of mankind are caused by the fear of it.

In all affairs it's a healthy thing now and then to hang a question mark on the things you have long taken for granted.

I like mathematics because it is not human and has nothing particular to do with this planet or with the whole accidental universe - because, like Spinoza's God, it won't love us in return.