I have never been able to understand why pigeon-shooting at Hurlingham should be refined and polite, while a rat-killing match in Whitechapel is low.

I have endeavoured to show that no absolute structural line of demarcation, wider than that between the animals which immediately succeed us in the scale, can be drawn between the animal world and ourselves; and I may add the expression of my belief that the attempt to draw a physical distinction is equally futile, and that even the highest faculties of feeling and of intellect begin to germinate in lower forms of life.

Teach a child what is wise, that is morality. Teach him what is wise and beautiful, that is religion!

Science is simply common sense at its best, that is, rigidly accurate in observation, and merciless to fallacy in logic.

There is but one right, and the possibilities of wrong are infinite.

Man's Place in Nature.

I wish you would let an old man, who has had his share of fighting, remind you that battles, like hypotheses, are not to be multiplied beyond necessity.