Men and nature must work hand in hand. The throwing out of balance of the resources of nature throws out of balance also the lives of men.

The false interpreters of nature declare that quicksilver is the common seed of every metal, not remembering that nature varies the seed according to the variety of the things she desires to produce in the world.

One touch of nature makes the whole world kin.

Broadly speaking, human beings may be divided into three classes: those who are billed to death, those who are worried to death, and those who are bored to death.

Nature will not be admired by proxy.

A heightened sense of the observation of nature is one of the chief delights that have come to me through trying to paint. I accumulated in those years so fine a surplus in the Book of Observance that I have been drawing confidently upon it ever since.