“...the supply of uranium in the planet is very limited, and it is feared that it may be used up before the human race is exterminated, but if the practically unlimited supply of hydrogen in the sea could be utilized there would be considerable reason to hope that homo sapiens might put an end to himself, to the great advantage of the other less ferocious animals.”

“Reason may be a small force, but it is constant, and works always in one direction, while the forces of unreason destroy one another in futile strife. Therefore, every orgy of unreason in the end strengthens the friends of reason, and shows afresh that they are the only true friends of humanity.”

“The power of reason is thought small in these days, but I remain an unrepentant rationalist. Reason may be a small force, but it is constant, and works always in one direction, while the forces of unreason destroy one another in futile strife. Therefore every orgy of unreason in the end strengthens the friends of reason, and shows afresh that they are the only true friends of humanity.”

“I wish to propose for the reader's favourable consideration a doctrine which may, I fear, appear wildly paradoxical and subversive. The doctrine in question is this: that it is undesirable to believe a proposition when there is no ground whatever for supposing it true.”

“Science may set limits to knowledge, but should not set limits to imagination.”

“First: never use a long word if a short word will do. Second: if you want to make a statement with a great many qualifications, put some of the qualifications in separate sentences. Third: do not let the beginning of your sentence lead the reader to an expectation which is contradicted by the end.”

“There is one very serious defect to my mind in Christ's moral character, and that is that He believed in hell. I do not myself feel that any person who is really profoundly humane can believe in everlasting punishment...... There are other things of less importance. There is the instance of the Gadarene swine where it certainly was not very kind to the pigs to put devils into them and make them rush down the hill to the sea. You must remember that He was omnipotent, and He could have made the devils simply go away; but he chooses to send them into the pigs. Then there is the curious story of the fig-tree, which always rather puzzled me. You remember what happened about the fig-tree. 'He was hungry; and seeing a fig-tree afar off having leaves, He came if haply He might find anything thereon; and when He came to it He found nothing but leaves, for the time for figs was not yet. And Jesus answered and said unto it: "No man eat fruit of thee hereafter for ever,"...and Peter... saith unto Him: "Master, behold the fig-tree which thou cursedst is withered away".' This is a very curious story, because it was not the right time of year for figs, and you really could not blame the tree. I cannot myself feel that either in matter of wisdom or in matter of virtue Christ stands quite as high as some other people known to history. I think I should put Buddha and Socrates above Him in those respects.”