The main things which seem to me important on their own account, and not merely as means to other things, are knowledge, art, instinctive happiness, and relations of friendship or affection.

One of the chief triumphs of modern mathematics consists in having discovered what mathematics really is.

Calculus required continuity, and continuity was supposed to require the infinitely little; but nobody could discover what the infinitely little might be.

The essence of life is doing things for their own sakes.

While economics is about how people make choice, sociology is about how they don't have any choice to make.

There are still many people in America who regard depressions as acts of God. I think Keynes proved that the responsibility for these occurrences does not rest with Providence.

The . . . increase in the power of officials is a constant source of irritation to everybody else.