Indeed, the best books have a use, like sticks and stones, which is above or beside their design, not anticipated in the preface,not concluded in the appendix. Even Virgil's poetry serves a very different use to me today from what it did to his contemporaries. It has often an acquired and accidental value merely, proving that man is still man in the world.

Only he is successful in his business who makes that pursuit which affords him the highest pleasure sustain him.

He is not a true man of science who does not bring some sympathy to his studies, and expect to learn something by behavior as well as by application. It is childish to rest in the discovery of mere coincidences, or of partial and extraneous laws. The study of geometry is a petty and idle exercise of the mind, if it is applied to no larger system than the starry one. Mathematics should be mixed not only with physics but with ethics; that is mixed mathematics. The fact which interests us most is the life of the naturalist. The purest science is still biographical.

Nature seemed to have adorned herself for our departure with a profusion of fringes and curls, mingled with the bright tints of flowers, reflected in the water. But we missed the white water-lily, which is the queen of river flowers, its reign being over for this season.... Many of this species inhabit our Concord water.

What recommends commerce to me is its enterprise and bravery. It does not clasp its hands and pray to Jupiter.

The devil finds work for idle hands.

When the true criminals are running around free, the only honorable place for a decent human being is in prisons.