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The facts of variability, of the struggle for existence, of adaptation to conditions, were notorious enough; but none of us had suspected that the road to the heart of the species problem lay through them, until Darwin and Wallace dispelled the darkness.

Thomas Huxley
Struggle, Heart, Darkness
Leonard Huxley, Thomas Henry Huxley (2011). “Life and Letters of Thomas Henry Huxley”, p.246, Cambridge University Press
The facts of variability, of the struggle for existence, of adaptation to conditions, were notorious enough; but none of us had suspected that the road to the heart of the species problem lay through them, until Darwin