I read (okay, intermittently skimmed) Walden. The style hasn’t aged all that well, and Thoreau is very preachy…but, this is a good line:
Simplicity, simplicity, simplicity! I say, let your affairs be as two or three, and not a hundred or a thousand; instead of a million, count half a dozen, and keep your accounts on your thumbnail. In the midst of this chopping sea of civilized life, such are the clouds and storms and quicksands and thousand-and-one items to be allowed for, that a man has to live.
Essentialism, minimalism, etc, about 150 years before it became popular again. The best line:
As if you could kill time without injuring eternity.