Via brainpickings:
The trick is, I find, to tone your wants and tastes low down enough, and make much of negatives, and of mere daylight and the skies.
[…]
After you have exhausted what there is in business, politics, conviviality, love, and so on — have found that none of these finally satisfy, or permanently wear — what remains? Nature remains; to bring out from their torpid recesses, the affinities of a man or woman with the open air, the trees, fields, the changes of seasons — the sun by day and the stars of heaven by night. — Walt Whitman
