"Good similes depend upon close observation. They depend upon brevity and wit....They have to fit in context."

Previous Quote

... if variations useful to any organic being do occur, assuredly individuals thus characterized will have the best chance of being perserved in the struggle for life; and from the strong principle of inheritance they will tend to produce offsping similarly characterized. This principle of preservation, I have called, for the sake of brevity, Natural Selection.

— Charles Darwin