16 For there were even in the Apostles' times some who preached the truth not in truth, that is, not with truthful mind: of whom the Apostle says that they preached Christ not chastely, but of envy and strife. And on this account even at that time some were tolerated while preaching truth not with a chaste mind: yet not any have been praised as preaching falsehood with a chaste mind. Lastly, he says of those, “Whether in pretence or in truth Christ be preached:” but in no wise would he say, In order that Christ may after be preached, let Him be first denied.
Source: To Consentius: Against Lying (New Advent)