Unless a man has been taught what to do with success after getting it, the achievement of it must inevitably leave him a prey to boredom.

A proverb is one man's wit and all men's wisdom.

It is not by delusion, however exalted, that mankind can prosper, but only by unswerving courage in the pursuit of truth.

We have in fact, two kinds of morality, side by side: one which we preach, but do not practice, and another which we practice, but seldom preach.

I believe that the abolition of private ownership of land and capital is a necessary step toward any world in which the nations are to live at peace with one another.

Science is what we know, and philosophy is what we don't know.

The method of "postulating" what we want has many advantages; they are the same as the advantages of theft over honest toil.