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.

“The rung of a ladder was never meant to rest upon, but only to hold a man's foo…”

“If a little knowledge is dangerous, where is the man (sic) who has so much as t…”

“It is not what we believe, but why we believe it. Moral responsibility lies in …”

“I am too much of a skeptic to deny the possibility of anything.”