Our friendships hurry to short and poor conclusions, because we have made them a texture of wine and dreams, instead of the toughfibre of the human heart. The laws of friendship are austere and eternal, of one web with the laws of nature and of morals.

All science has one aim, namely, to find a theory of nature.

Nature is thoroughly mediate. It is made to serve. It receives the dominion of man as meekly as the ass on which the Saviour rode.It offers all its kingdoms to man as the raw material which he may mould into what is useful. Man is never weary of working it up.

The Good Spirit never cared for the colleges, and though all men and boys were now drilled in Greek, Latin, and Mathematics, it had quite left these shells high on the beach, and was creating and feeding other matters [science] at other ends of the world.

We dress our garden, eat our dinners, discuss the household with our wives, and these things make no impression, are forgotten next week; but in the solitude to which every man is always returning, he has a sanity and revelations, which in his passage into new worlds he will carry with him. Never mind the ridicule, never mind the defeat: up again, old heart! — it seems to say, — there is victory yet for all justice; and the true romance which the world exists to realize, will be the transformation of genius into practical power.

By his machines man can dive and remain under water like a shark; can fly like a hawk in the air; can see atoms like a gnat; can see the system of the universe of Uriel, the angel of the sun; can carry whatever loads a ton of coal can lift; can knock down cities with his fist of gunpowder; can recover the history of his race by the medals which the deluge, and every creature, civil or savage or brute, has involuntarily dropped of its existence; and divine the future possibility of the planet and its inhabitants by his perception of laws of nature.

Guard your own spare moments. They are like uncut diamonds.