I would give absolutely nothing for the theory of Natural Selection, if it requires miraculous additions at any one stage of descent.
Charles DarwinEvery new body of discovery is mathematical in form, because there is no other guidance we can have.
Charles DarwinThe love of a dog for his master is notorious; in the agony of death he has been known to caress his master, and everyone has heard of the dog suffering under vivisection, who licked the hand of the operator; this man, unless he had a heart of stone, must have felt remorse to the last hour of his life.
Charles Darwin