Mysterious and Unexplorable

"Every blade in the field -
Every leaf in the forest -
lays down its life in its season
as beautifully as it was taken up.

...

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.

...

We need the tonic of wildness...At the same time that we are earnest to explore and learn all things, we require that all things be mysterious and unexplorable, that land and sea be indefinitely wild, unsurveyed and unfathomed by us because unfathomable. We can never have enough of nature."

- Henry David Thoreau (1817 - 1862)