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thinking about this bit from Montaigne this morning:
The philosophers, Chrysippus and Epicurus, were in this of two quite contrary humours: the first not only in his books mixed passages and sayings of other authors, but entire pieces, and, in one, the whole Medea of Euripides; ...
... which gave Apollodorus occasion to say, that should a man pick out of his writings all that was none of his, he would leave him nothing but blank paper: whereas the latter, quite on the contrary, in three hundred volumes that he left behind him, has not so much as one quotation.