Nicene and Post-Nicene Fathers, Vol. IV:
Writings in Connection with the Donatist Controversy.: Chapter 13

Chapter 13.—14.  If, therefore, I am a servant of the Lord, and a soldier that is not reprobate, with whatever eloquence Petilianus stands forth reviling me, ought I in any way to be annoyed that he has been appointed for p. 603 me as a most accomplished craftsman of the armor on the left?  It is necessary that I should fight in this armor as skillfully as possible in defence of my Lord, and should smite with it the enemy against whom I wage an unseen fight, who in all cunning strives and endeavors, with the most perverse and ancient craftiness, that this should lead me to hate Petilianus, and so be unable to fulfill the command which Christ has given, that we should "love our enemies." 2365   But from this may I be saved by the mercy of Him who loved me, and gave Himself for me, so that, as He hung upon the cross, He said, "Father, forgive them; for they know not what they do;" 2366 and so taught me to say of Petilianus and all other enemies of mine like him "Father, forgive them; for they know not what they do.’

Footnotes

Luke vi. 35.

Luke xxiii. 34.