One touch of nature makes the whole world kin.

Nature will not be admired by proxy.

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.

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.

Man selects only for his own good: Nature only for that of the being which she tends.

I do not see why man should not be just as cruel as nature.