6. But taking timely warning, and leaving many things unsaid on this topic, but not longer omit our homage to the Efficient Nature, natura naturans, the quick cause, before which all forms flee as the driven snows, itself secret, its works driven before it in flocks and multitudes, (as the ancient represented nature by Proteus, a shepherd), and in undescribable variety. It publishes itself in creatures, reaching from particles and spicula, through transformation on transformation to the highest symmetries, arriving at consummate results without a shock or a leap. A little heat, that is, a little motion, is all that differences the bald, dazzling white, and deadly cold poles of the earth from the prolific tropical climates. All changes pass without violence, by reason of the two cardinal conditions of boundless space and boundless time. Geology has initiated us into the secularity of nature, and taught us to disuse our dame-school measures, and exchange our Mosaic and Ptolemaic schemes for her large style. We know nothing rightly, for want of perspective. Now we learn what patient periods must round themselves before the rock is formed, then before the rock is broken, and the first lichen race has disintegrated the thinnest external plate into soil, and opened the door for the remote Flora, Fauna, Ceres, and Pomona, to come in. How far off yet is the trilobite! how far the quadruped! how inconceivably remote is man! All duly arrive, and then race after race of men. It is a long way from granite to the oyster; farther yet to Plato, and the preaching of the immortality of the soul. Yet all must come, as surely as the first atom has two sides.
7. Motion or change, and identity or rest, are the first and second secrets of nature: Motion and Rest. The whole code of her laws may be written on the thumb-nail, or the signet of a ring. The whirling bubble on the surface of a brook, admits us to the secret of the mechanics of the sky. Every shell on the beach is a key to it. A little water made to rotate in a cup explains the formation of the simpler shells; the addition of matter from year to year, arrives at last at the most complex forms; and yet so poor is nature with all her craft, that, from the beginning to the end of the universe, she has but one stuff, — but one stuff with its two ends, to serve up all her dream-like variety. Compound it how she will, star, sand, fire, water, tree, man, it is still one stuff, and betrays the same properties.
