I have no great quickness of apprehension or wit which is so remarkable in some clever men, for instance Huxley
Charles DarwinEach organic being is striving to increase in a geometrical ratio . . . each at some period of its life, during some season of the year, during each generation or at intervals, has to struggle for life and to suffer great destruction . . . The vigorous, the healthy, and the happy survive and multiply.
Charles Darwin