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The British philosopher Bertrand Russell said that philosophy went downhill after Democritus and did not recover until the Renaissance.

Leon M. Lederman, Dick Teresi (1993). “The God Particle: If the Universe is the Answer, what is the Question?”, p.61, Houghton Mifflin Harcourt
The British philosopher Bertrand Russell said that philosophy went downhill after Democritus and did not recover until the Renaissance.