Our faculties are more fitted to recognize the wonderful structure of a beetle than a Universe.

Why does man regret, even though he may endeavour to banish any such regret, that he has followed the one natural impulse, rather than the other; and why does he further feel that he ought to regret his conduct? Man in this respect differs profoundly from the lower animals.

It is like confessing to a murder.

Daily it is forced home on the mind of the biologist that nothing, not even the wind that blows, is so unstable as the level of the crust of this earth.

We cannot fathom the marvelous complexity of an organic being; but on the hypothesis here advanced this complexity is much increased. Each living creature must be looked at as a microcosm--a little universe, formed of a host of self-propagating organisms, inconceivably minute and as numerous as the stars in heaven.

I have at least, as I hope, done good service in aiding to overthrow the dogma of separate creations.

There is no fundamental difference between man and animals in their ability to feel pleasure and pain, happiness, and misery.