[Predation is] a great evil that a wise or benevolent creator would have avoided. - Alexander Skutch

After long pondering, I believe that I can define good and evil in terms to which even a biologist of the mechanical school can hardly take exception. At least, I fancy that I can do so for evil. The great evil of life is parasitism.

Earth has no more distressing spectacle than that of a predator suddenly striking down some defenseless creature innocently singing or attending its young, no sight more pitifully repulsive than the hideously mangled remains of what, a few hours before, was a beautiful animal enjoying its life.

[If evolution had been guided, the Earth would have become] the abode of a vast diversity of creatures dwelling in concord (instead of) a place of mixed character, where beauty and ugliness, peace and fear, happiness and horror, mingle together in the most perplexing contrasts.