From 'View From a Height', by Isaac Asimov: "And just as an organism in the embryonic stages seems to race through the aeons of evolutionary development, from

From 'View From a Height', by Isaac Asimov: "And just as an organism in the embryonic stages seems to race through the aeons of evolutionary development, from single cell to ultimate complexity, in mere weeks or months; so the individual scientist in the course of their life repeats the history of science and loses themselves, by progressive stages, in the orchard [of science]."