Every ist writes his own autobiography.

There is held to be no surer test of civilization than the increase per head of the consumption of alcohol and tobacco. Yet alcohol and tobacco are recognizable poisons, so that their consumption has only to be carried far enough to destroy civilization altogether.

Thinking in its lower grades, is comparable to paper money, and in its higher forms it is a kind of poetry.

Every man of genius sees the world at a different angle from his fellows, and there is his tragedy.

The greatest task before civilization at present is to make machines what they ought to be, the slaves, instead of the masters of men.

At the present day the crude theory of the sexual impulse held on one side, and the ignorant rejection of theory altogether on the other side, are beginning to be seen as both alike unjustified.

Here, where we reach the sphere of mathematics, we are among processes which seem to some the most inhuman of all human activities and the most remote from poetry. Yet it is here that the artist has the fullest scope of his imagination.