"Nature is neither kind or unkind. She is neither against suffering or for it..."
and "...The total amount of suffering per year is beyond all decent contemplation. During the minute that it takes me to compose this sentence, thousands of animals are being eaten alive, others are running for their lives, whimpering with fear, others are being slowly devoured from within by rasping parasites, thousands of all kinds are dying of starvation, thirst and disease..." and
"If there is ever a time of plenty this very fact will lead to an increase in population until the natural state of starvation and misery is restored."
Charles Darwin