Building a better mousetrap merely results in smarter mice.

With mammals the male appears to win the female much more through the law of battle than through the display of his charms.

From my early youth I have had the strongest desire to understand or explain whatever I observed. ... To group all facts under some general laws.

Nothing can be more improving to a young naturalist, than a journey in a distant country.

I think it can be shown that there is such an unerring power at work in Natural Selection, which selects exclusively for the good of each organic being.

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.

One general law, leading to the advancement of all organic beings, namely, multiply, vary, let the strongest live and the weakest die.