Civilized people cannot fully satisfy their sexual instinct without love.

Is the set of all sets which are not members of themselves a member of itself?

Awareness of universals is called conceiving, and a universal of which we are aware is called a concept.

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.

As soon as we abandon our own reason, and are content to rely upon authority, there is no end to our trouble. . . . No Catholic, for instance, takes seriously the text which says that a Bishop should be the husband of one wife.

As men begin to grow civilized, they cease to be satisfied with mere taboos.

Prison is a severe and terrible punishment; but for me, thanks to Arthur Balfour, this was not so. I was much cheered on my arrival by the warder at the gate, who had to take particulars about me. He asked my religion, and I replied 'agnostic.' He asked how to spell it, and remarked with a sigh: 'Well, there are many religions, but I suppose they all worship the same God.' This remark kept me cheerful for about a week.