From A Room of One’s Own by Virginia Woolf:

For masterpieces are not single and solitary births; they are the outcome of many years of thinking in common, of thinking by the body of the people, so that the experience of the mass is behind one single voice.

(Thanks to Mengfei for giving me this book. Woolf is hard to read, but given the number of Post-It flags sticking out from the pages, I’d say this is worth it.)