You put three facts together - that all organisms produce more offspring that can survive, that there's variation among organisms, and that at least some of that variation is inherited - and the syllogistic inference is natural selection.
Stephen Jay GouldWe are the offspring of history, and must establish our own paths in this most diverse and interesting of conceivable universesโone indifferent to our suffering, and therefore offering us maximum freedom to thrive, or to fail, in our own chosen way.
Stephen Jay GouldLife began three and a half billion years ago, necessarily about as simple as it could be, because life arose spontaneously from the organic compounds in the primeval oceans.
Stephen Jay GouldThe modern theory of evolution does not require gradual change. It in fact, the operation of Darwinian processes should yield exactly what we see in the fossil record. It is gradualism that we must reject, not Darwinism.
Stephen Jay Gould