1 The sheets that you send me cover me at once with compliments and confusion; for, while they praise my ability, they take away my sincerity in the faith. But as both at Alexandria and at Rome and, I may say, throughout the whole world good men have made it a habit to take the same liberties with my name, esteeming me only so far that they cannot bear to be heretics without having me of the number, I will leave aside personalities and only answer specific charges. For it is of no benefit to a cause to encounter railing with railing and to retaliate for attacks upon oneself by attacks upon one's opponents. We are commanded not to return evil for evil but to overcome evil with good, to take our fill of insults, and to turn the other cheek to the smiter.
Source: Letters (New Advent)