I remain convinced that obstinate addiction to ordinary language in our private thoughts is one of the main obstacles to progress in philosophy.

To abandon the struggle for private happiness, to expel all eagerness of temporary desire, to burn with passion for eternal things-this is emancipation, and this is the free man's worship... United with his fellow men by the strongest of all ties, the tie of a common doom, the free man finds that a new vision is with him always, shedding over every daily task the light of love.

I consider the official Catholic attitude on divorce, birth control, and censorship exceedingly dangerous to mankind.

If a Black Death could be spread throughout the world once in every generation survivors could procreate freely without making the world too full.

We need a science to save us from science.

There is in Aristotle an almost complete absence of what may be called benevolence or philanthropy. The sufferings of mankind . . . there is no evidence that they cause him unhappiness except when the sufferers happen to be his friends.

We must be sceptical even of our scepticism.