He [Pliny the Elder] used to say that 'no book [etc] was so bad but some good might be got out of it'.
Pliny the YoungerSo we must work at our profession and not make anybody else's idleness an excuse for our own. There is no lack of readers and listeners; it is for us to produce something worth being written and heard.
Pliny the YoungerFor however often a man may receive an obligation from you, if you refuse a request, all former favors are effaced by this one denial.
Pliny the Younger