When the last tree is cut, the last fish is caught, and the last river is polluted; when to breathe the air is sickening, you will realize, too late, that wealth is not in bank accounts and that you can't eat money.
Human reason has this peculiar fate that in one species of its knowledge it is burdened by questions which, as prescribed by the very nature of reason itself, it is not able to ignore, but which, as transcending all its powers, it is also not able to answer.
But mighty Nature bounds as from her birth;
The sun is in the heavens, and life on earth:
Flowers in the valley, splendor in the beam,
Health on the gale, and freshness in the stream.
Reason must approach nature with the view, indeed, of receiving information from it, not, however, in the character of a pupil, who listens to all that his master chooses to tell him, but in that of a judge, who compels the witnesses to reply to those questions which he himself thinks fit to propose. To this single idea must the revolution be ascribed, by which, after groping in the dark for so many centuries, natural science was at length conducted into the path of certain progress.
As I walked in the woods I felt what I often feel that nothing can befall me in life, no calamity, no disgrace (leaving me my eyes) to which Nature will not offer a sweet consolation. Standing on the bare ground with my head bathed by the blithe air, & uplifted into the infinite space, I become happy in my universal relations. The name of the nearest friend sounds then foreign & accidental. I am the heir of uncontained beauty and power.
The idiot, the Indian, the child and unschooled farmer's boy stand nearer to the light by which nature is to be read, than the dissector or the antiquary.