in Thoreau’s Journal:

On Heywood’s Peak by Walden. —The surface is not perfectly smooth, on account of the zephyr, and the reflections of the woods are a little indistinct and blurred. How soothing to sit on a stump on this height, over-looking the pond, and study the dimpling circles which are incessantly inscribed and again erased on the smooth and otherwise invisible surface, amid the reflected skies! The reflected sky is of a deeper blue. How beautiful that over this vast expanse there can be no disturbance, but it is thus at once gently smoothed away and assuaged, as, when a vase of water is jarred, the trembling circles seek the shore and all is smooth again!  Not a fish can leap or an insect fall on it but it is reported in lines of beauty—in circling dimples—as it were the constant welling up of its fountain—the gentle pulsing of its life—the heaving of its breast.  The thrills of joy & those of pain are indistinguishable. How sweet the phenomena of the lake—! Everything that moves on its surface produces a sparkle. The peaceful Pond!