The only ethical principle which has made science possible is that the truth shall be told all the time. If we do not penalize false statements made in error, we open up the way for false statements by intention. And a false statement of fact, made deliberately, is the most serious crime a scientist can commit.

... at no point have I yet found artistic truth and theological truth at variance.

If we did not know all His retorts by heart, if we had not taken the sting out of them by incessant repetition in the accents of the pulpit, and if we had not somehow got it into our heads that brains were rather reprehnsible, we should reckon Him among the greatest wits of all time. Nobody else, in three brief years, has achieved such an output of epigram.

There is, in fact, a paradox about working to serve the community, and it is this: that to aim directly at serving the community is to falsify the work; the only way to serve the community is to forget the community and serve the work.

Passion's a good, stupid horse that will pull the plough six days a week if you give him the run of his heels on Sundays. But love's a nervous, awkward, over-mastering brute; if you can't rein him, it's best to have no truck with him.

The doctrine of hell is not "mediaeval priestcraft" for frightening people into giving money to the church: it is Christ's deliberate judgment on sin.... We cannot repudiate hell without altogether repudiating Christ.

It is fatal to let people suppose that Christianity is only a mode of feeling; it is vitally necessary to insist that it is first and foremost a rational explanation of the universe.