Every Christian church has tried to impose a code of morals of some kind for which it has claimed divine sanction. As these codes have always been opposed to those of the gospels a loophole has been left for moral progress such as hardly exists in other religions.

Daedalus; or, Science and the future: a paper read to the Heretics, Cambridge, on February 4th, 1923 (ed. Dutton, 1924)