“Truth can understand error, but error cannot understand truth.”

“Teach to the young, men's enduring truths, and let the learned amuse themselves with their passing errors.”

“The whole secret of mysticism is this: that man can understand everything by the help of something he cannot understand.”

“You can only find truth with logic if you have already found truth without it.”

“Great truths can only be forgotten and can never be falsified.”

“The man who cannot believe his senses, and the man who cannot believe anything else, are both insane, but their insanity is proved not by any error in their argument, but by the manifest mistake of their whole lives. They have both locked themselves up in two boxes, painted inside with the sun and stars; they are both unable to get out, the one into the health and happiness of heaven, the other even into the health and happiness of the earth.”

“But of all the instances of error arising from this physical fancy, the worst is that we have before us: the habit of exhaustively describing a social sickness, and then propounding a social drug.”