Evolution is written on the wings of butterflies.

Such simple instincts as bees making a beehive could be sufficient to overthrow my whole theory.

Through his powers of intellect, articulate language has been evolved; and on this his wonderful advancement has mainly depended.

How paramount the future is to the present when one is surrounded by children.

I believe man... in the same predicament with other animals.

If I had my life to live over again, I would have made a rule to read some poetry and listen to some music at least once every week.

Man selects only for his own good: Nature only for that of the being which she tends.