When the views entertained in this volume on the origin of species, or when analogous views are generally admitted, we can dimly forsee that there will be a considerable revolution in natural history.
Natural selection acts solely by accumulating slight successive favorable variations, it can produce no great or sudden modification; it can act only by very short steps.
As natural selection works solely by and for the good of each being, all corporeal and mental endowments will tend to progress toward perfection.
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.
The survival or preservation of certain favoured words in the struggle for existence is natural selection.
Sympathy will have been increased through natural selection
Multiply, vary, let the strongest live and the weakest die.
I would give absolutely nothing for the theory of Natural Selection, if it requires miraculous additions at any one stage of descent.