Already, by the first of September, I had seen two or three small maples turned scarlet across the pond, beneath where the white stems of three aspens diverged, at the point of a promontory, next the water. Ah, many a tale their color told!—Walden
[A]nd even the sepals from which the birds have picked the berries are a brilliant lake-red, with crimson flame-like reflections, equal to anything of the kind,—all on fire with ripeness—"Autumnal Tints"
And, above all, there is this difference between resisting this and a purely brute or natural force, that I can resist this with some effect; but I cannot expect, like Orpheus, to change the nature of the rocks and trees and beasts.—"Civil Disobedience"
As Anacreon says "the works of men shine," so the sounds of men and birds are musical.—Journal, 8 March 1853
As I came home through the woods with my string of fish, trailing my pole, it being now quite dark, I caught a glimpse of a woodchuck stealing across my path, and felt a strange thrill of savage delight, and was strongly tempted to seize and devour him raw; not that I was hungry then, except for that wildness which he represented.—Walden
As in many countries precious metals belong to the crown, so here more precious natural objects of rare beauty should belong to the public.—Journal, 3 January 1861
As it is important to consider Nature from the point of view of science remembering nomenclature and system of men, and so, if possible, go a step further in that direction, so it is equally important often to ignore or forget all that men presume they know, and take an original and unprejudiced view of Nature, letting her make what impression she will on you, as the first men, and all children and natural men still do.—Journal, 28 February 1860
As naturally as the oak bears an acorn, and the vine a gourd, man bears a poem, either spoken or done.—A Week on the Concord and Merrimack Rivers 
As we stood on the pile of chips by the door, fish hawks were sailing overhead; and here, over Shad Pond, might daily be witnessed the tyranny of the bald eagle over that bird.—The Maine Woods
At present, in this vicinity, the best part of the land is not private property; the landscape is not owned, and the walker enjoys comparative freedom. But possibly the day will come when it will be partitioned off into so-called pleasure grounds, in which a few will take a narrow and exclusive pleasure only,—when fences shall be multiplied, and man traps and other engines invented to confine men to the public road; and walking over the surface of God’s earth, shall be construed to mean trespassing on some gentleman’s grounds. To enjoy a thing exclusively is commonly to exclude yourself from the true enjoyment of it. Let us improve our opportunities then before the evil days come.—"Walking"
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