Quintilian, Inst. Orat. 3.6.
“I admit that I now have a bit of a different opinion from what I believed before. Perhaps it would be safest for my reputation to change nothing which I not only believed but also approved for many years. But I cannot endure knowing that I misrepresent myself, especially in this work which I compose as some help for our good students. For even Hippocrates, famous still for his skill in medicine, seems to have conducted himself very honorably when he admitted his own errors so his followers would not make a mistake. Marcus Tullius did not hesitate to condemn some of his own books in subsequent publications, the Catulus and Lucullus, for example.
Prolonged effort in research would certainly be useless if we were not allowed to improve upon previous opinions. Nevertheless, nothing of what I taught then was useless. These things I offer…
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