"Every now and then a man's mind is stretched by a new idea or sensation, and never shrinks back to its former dimensions. After looking at the Alps, I felt that my mind had been stretched beyond the limits of its elasticity, and fitted so loosely on my old ideas of space that I had to spread these to fit it."

“Time, time only, can gradually wean us from our Epeolatry, or word-worship, by spiritualizing our ideas of the thing signified.”

“Boston State-house is the hub of the solar system. You couldn't pry that out of a Boston man if you had the tire of all creation straightened out for a crow-bar.”

“I do not know in what shape the practical question may present itself to you; but I will tell you my rule in life, and I think you will find it a good one. Treat bad men exactly as if they were insane. They are in-sane, out of health, morally. Reason, which is food to sound minds, is not tolerated, still less assimilated, unless administered with the greatest caution; perhaps, not at all. Avoid collision with them, so far as you honorably can; keep your temper, if you can,—for one angry man is as good as another; restrain them from violence, promptly, completely, and with the least possible injury, just as in the case of maniacs,—and when you have got rid of them, or got them tied hand and foot so that they can do no mischief, sit down and contemplate them charitably...”

“I try his head occasionally as housewives try eggs,— give it an intellectual shake and hold it up to the light, so to speak, to see if it has life in it, actual or potential, or only contains lifeless albumen.”

“I have always considered my face a convenience rather than an ornament.”

“Insanity is often the logic of an accurate mind overtasked. Good mental machinery ought to break its own wheels and levers, if anything is thrust among them suddenly which tends to stop them or reverse their motion. A weak mind does not accumulate force enough to hurt itself; stupidity often saves a man from going mad.”