"Invest in the millennium. Plant sequoias. Say that your main crop is the forest that you did not plant, that you will not live to harvest. Say that the leaves are harvested when they have rotted into the mold. Call that profit. Prophesy such returns. Put your faith in the two inches of humus that will build under the trees every thousand years."

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Natural history is a matter of observation; it is a harvest which you gather when and where you find it growing. Birds and squirrels and flowers are not always in season, but philosophy we have always with us. It is a crop which we can grow and reap at all times and in all places and it has its own value and brings its own satisfaction.

— John Burroughs