A single ego is an absurdly narrow vantage point from which to view the world.

It is a terrible error to let any natural impulse, physical or mental, stagnate. Crush it out, if you will, and be done with it; or fulfil it, and get it out of the system; but do not allow it to remain there and putrefy. The suppression of the normal sex instinct, for example, is responsible for a thousand ills. In Puritan countries one inevitably finds a morbid preoccupation with sex coupled with every form of perversion and degeneracy.

We can no longer assert any single proposition, unless we guard ourselves by enumerating countless conditions which must be assumed.

I have been accused of being a ‘black magician.’ No more foolish statement was ever made about me. I despise the thing to such an extent that I can hardly believe in the existence of people so debased and idiotic as to practice it.

The customer is usually wrong, but statistics indicate that it doesn't pay to tell him so

What is necessary is not to seek after some fantastic ideal, utterly unsuited to our real needs, but to discover the true nature of those needs, to fulfill them, and rejoice therein.

The key of joy is disobedience.