Christianity is haunted by the theory of a God with a craving for bloody sacrifices.

A time will however come (as I believe) when physiology will invade and destroy mathematical physics, as the latter has destroyed geometry.

An ounce of algebra is worth a ton of verbal argument.

Science is vastly more stimulating to the imagination than the classics.

Until politics are a branch of science, we shall do well to regard political and social reforms as experiments rather than short-cuts to the millennium.

So many new ideas are at first strange and horrible though ultimately valuable that a very heavy responsibility rests upon those who would prevent their dissemination.

Would I lay down my life to save my brother? No, but I would to save two brothers or eight cousins.