Sympathy for the lowest animals is one of the noblest virtues with which man is endowed.
Charles DarwinBelieving as I do that man in the distant future will be a far more perfect creature than he now is, it is an intolerable thought that he and all other sentient beings are doomed to complete annihilation after such long-continued slow progress.
Charles DarwinThe tree of life should perhaps be called the coral of life, base of branches dead; so that passages cannot be seen-this again offers contradiction to constant succession of germs in progress.
Charles Darwin