"There is but one question ultimately to be asked respecting every line you draw, Is it right or wrong? If right, it most assuredly is not a "free" line, but an intensely continent, restrained and considered line; and the action of the hand in laying it is just as decisive, and just as "free" as the hand of a first-rate surgeon in a critical incision."

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The mortal enemies of man are not his fellows of another continent or race; they are the aspects of the physical world which limit or challenge his control, the disease germs that attack him and his domesticated plants and animals, and the insects that carry many of these germs as well as working notable direct injury. This is not the age of man, however great his superiority in size and intelligence; it is literally the age of insects.

— Warder Clyde Allee