"If you were dealing with the accumulated repressions of only one lifetime, it would be different. But these are the repressions of numerous lives. Nobody knows how many times you have been born, and how many societies have crushed you. And each time a different society, and all these societies destroying you in different ways... this is why you carry so many inner contradictions."

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Paleontologists had long been aware of a seeming contradiction between Darwin's postulate of gradualism, confirmed by the work of population genetics, and the actual findings of paleontology. Following phyletic lines through time seemed to reveal only minimal gradual changes but no clear evidence for any change of a species into a different genus or for the gradual origin of an evolutionary novelty. Anything truly novel always seemed to appear quite abruptly in the fossil record.

— Ernst Mayr