Thoreau writes in his journal:
Every part of nature teaches that the passing away of one life is the making room for another. The oak dies down to the ground, leaving within its rind a rich virgin mould, which will impart a vigorous life to an infant forest. The pine leaves a sandy and sterile soil, the harder woods a strong and fruitful mould.
So this constant abrasion and decay makes the soil of my future growth. As I live now so shall I reap. If I grow pines and birches, my virgin mould will not sustain the oak; but pines and birches, or, perchance, weeds and brambles, will constitute my second growth.
