If one can trust David Ferry, Horace's remark on Cestus means rather that Cestus should write from his own experience and with his own diction rather than borro

If one can trust David Ferry, Horace's remark on Cestus means rather that Cestus should write from his own experience and with his own diction rather than borrowing from his predecessors (I suppose Greeks). (David Ferry, The Epistles of Horace). And Horace was not (after Philippi) a rebel. Read what he wrote about Augustus, Agrippa, and Maecenas.