I admire still more than the saw-mill the skill which, on the sea-shore, makes the tides drive the wheels and grind corn, and which thus engages the assistance of the moon, like a hired hand, to grind, and wind, and pump, and saw, and split stone, and roll iron. Now that is the wisdom of a man, in every instance of his labor, to hitch his wagon to a star, and see his chore done by the gods themselves. That is the way we are strong, by borrowing the might of the elements. The forces of steam, gravity, galvanism, light, magnets, wind, fire, serve us day by day, and cost us nothing. Our astronomy is full of examples of calling in the aid of these magnificent helpers. Thus, on a planet so small as ours, the want of an adequate base for astronomical measurements is early felt, as, for example, in detecting the parallax of a star. But the astronomer, having by an observation fixed the place of a star, by so simple an expedient as waiting six months, and then repeating his observation, contrived to put the diameter of the earth's orbit, say two hundred millions of miles, between his first observation and his second, and this line afforded him a respectable base for his triangle. All our arts aim to win this vantage. We cannot bring the heavenly powers to us, but, if we will only choose our jobs in directions in which they travel, they will undertake them with the greatest pleasure. It is a peremptory rule with them, that _they never go out of their road_. We are dapper little busybodies, and run this way and that way superserviceably; but they swerve never from their fore-ordained paths,--neither the sun, nor the moon, nor a bubble of air, nor a mote of dust. And as our handiworks borrow the elements, so all our social and political action leans on principles. To accomplish anything excellent, the will must work for catholic and universal ends. A puny creature walled in on every side, as Donne wrote,-- ------"unless above himself he can Erect himself, how poor a thing is man!" but when his will leans on a principle, when he is the vehicle of ideas, he borrows their omnipotence. Gibraltar may be strong, but ideas are impregnable, and bestow on the hero their invincibility. "It was a great instruction," said a saint in Cromwell's war, "that the best courages are but beams of the Almighty." Hitch your wagon to a star. Let us not fag in paltry works which serve our pot and bag alone. Let us not lie and steal. No god will help. We shall find all their teams going the other way,--Charles's Wain, Great Bear, Orion, Leo, Hercules:--every god will leave us. Work rather for those interests which the divinities honor and promote,--justice, love, freedom, knowledge, utility.