in Thoreau’s Journal:

After spending four or five days surveying and drawing a plan incessantly, I especially feel the necessity of putting myself in communication with nature again, to recover my tone, to withdraw out of the wearying and unprofitable world of affairs. The things I have been doing have but a fleeting and accidental importance, however much men are immersed in them, and yield very little valuable fruit. I would fain have been wading through the woods and fields and conversing with the sane snow.

Having waded in the very shallowest stream of time, I would now bathe my temples in eternity. I wish again to participate in the serenity of nature, to share the happiness of the river and the woods. I thus from time to time break off my connection with eternal truths and go with the shallow stream of human affairs, grinding at the mill of the Philistines; but when my task is done, with never-failing confidence I devote myself to the infinite again. It would be sweet to deal with men more, I can imagine, but where dwell they? Not in the fields which I traverse.