More cranks take up unfashionable errors than unfashionable truths.

Even in civilized mankind faint traces of monogamous instinct can be perceived.

The dictum that human nature cannot be changed is one of those tiresome platitudes that conceal from the ignorant the depths of their own ignorance.

None but a coward dares to boast that he has never known fear.

It is in our hearts that evil lies, and it is from our hearts that it must be plucked out.

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.

Sir Arthur Eddington deduces religion from the fact that atoms do not obey the laws of mathematics. Sir James Jeans deduces it from the fact that they do.