Look over and over again[ into the merits of] such a one, as you recommend; lest afterward the faults of others strike you with shame. We are sometimes imposed upon, and now and then introduce an unworthy person. Wherefore, once deceived, forbear to defend one who suffers by his own bad conduct; but protect one whom you entirely know, and with confidence guard him with your patronage, if false accusations attack him: who being bitten with the tooth of calumny ,do you not perceive that the same danger is threatening you? For it is your own concern, when the adjoining wall is on fire: and flames neglected are wo nt to gain strength. 