Suppose atomic bombs had reduced the population of the world to one brother and sister; should they let the human race die out?

Morally, a philosopher who uses his professional competence for anything except a disinterested search for truth is guilty of a kind of treachery.

One must care about a world one will not see.

And if there were a God, I think it very unlikely that He would have such an uneasy vanity as to be offended by those who doubt His existence

Against the vast majority of my countrymen, even at this moment, in the name of humanity and civilization, I protest against our share in the destruction of Germany. A month ago Europe was a peaceful comity of nations; if an Englishman killed a German, he was hanged. Now, if an Englishman kills a German, or if a German kills an Englishman, he is a patriot, who has deserved well of his country.

The mind is a strange machine which can combine the materials offered to it in the most astonishing ways.

The whole realm of thought and opinion is utterly unsuited to public control; it ought to be as free, and as spontaneous as is possible. The state is justified in insisting that children shall be educated, but it is not justified in forcing their education to proceed on a uniform plan and to be directed to the production of a dead level of glib uniformity.