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.

What is the use of a house if you haven't got a tolerable planet to put it on?

Nature refuses to sympathize with our sorrow. She seems not to have provided for, but by a thousand contrivances against it.

The improved means to the unimproved end.

We can never have enough of Nature.