Some of my critics have said, "Oh, he is a good observer, but has no power of reasoning." I do not think that this can be true, for the Origin of Spe… - Charles Darwin

Animals whom we have made our slaves we do not like to consider our equals. — Do not slave holders wish to make the black man other kind? — animals with affections, imitation, fear of death, pain, sorrow for the dead. — respect.

I own that I cannot see as plainly as others do, and as I should wish to do, evidence of design and beneficence on all sides of us. There seems to me too much misery in the world. I cannot persuade myself that a beneficent and omnipotent God would have designedly created the Ichneumonidae with the express intention of their feeding within the living bodies of Caterpillars, or that a cat should play with mice.

… cell of a tentacle, showing the various forms successively assumed by the aggregated masses of protoplasm.