“All progress is based upon a universal innate desire on the part of every organism to live beyond its income”

“I know not why, but all the noblest arts hold in perfection but for a very little moment. They soon reach a height from which they begin to decline, and when they have begun to decline it is a pity that they cannot be knocked on the head; for an art is like a living organism—better dead than dying.”

“There are more fools than knaves in the world, else the knaves would not have enough to live upon.”

“I remember one incident which bears upon this part of the treatise. The gentleman who gave it to me had asked to see my tobacco-pipe; he examined it carefully, and when he came to the little protuberance at the bottom of the bowl he seemed much delighted, and exclaimed that it must be rudimentary. I asked him what he meant."Sir," he answered, "this organ is identical with the rim at the bottom of a cup; it is but another form of the same function. Its purposes must have been to keep the heat of the pipe from marking the table upon which it rested. You would find, if you were to look up the history of tobacco-pipes, that in early specimens this protuberance was of a different shape to what it is now. It will have been broad at the bottom, and flat, so that while the pipe was being smoked the bowl might rest upon the table without marking it. Use and disuse must have come into play and reduced the function its present rudimentary condition. I should not be surprised, sir," he continued, "if, in the course of time, it were to become modified still farther, and to assume the form of an ornamental leaf or scroll, or even a butterfly, while in some cases, it will become extinct.”

“All our lives long, every day and every hour, we are engaged in the process of accommodating our changed and unchanged selves to changed and unchanged surroundings: living, in fact, is nothing else than this process of accommodation; when we fail in it a little we are stupid, when flagrantly we are mad, when we give up the attempt altogether we die, when we suspend it temporarily we sleep.”

“To live is like to love--all reason is against it, and all healthy instinct for it”

“Happiness and misery consist in a progression towards better or worse; it does not matter how high up or low down you are, it depends not on this, but on the direction in which you are tending.”