Ephesians 4:32

For the expression, "forgiving one another," is this; be disposed, he means, to forgive one another. And this forgiveness is greater than that which is shown in money-matters. For he indeed who forgives a debt of money to him that has borrowed of him, does, it is true, a noble and admirable deed, but then the kindness is confined to the body, though to himself indeed he repays a full recompense by that benefit which is spiritual and concerns the soul; whereas he who forgives trespasses will be benefiting alike his own soul, and the soul of him who receives the forgiveness. For by this way of acting, he not only renders himself, but the other also, more charitable.

Because we do not so deeply touch the souls of those who have wronged us by revenging ourselves, as by pardoning them, and thus shaming them and putting them out of countenance. For by the other course we shall be doing no good, either to ourselves or to them, but shall be doing harm to both by seeking ourselves for retaliation, like the rulers of the Jews, and by kindling up the wrath that is in them; but if we return injustice with gentleness, we shall disarm all his anger, and shall be setting up in his breast a tribunal which will give a verdict in our favor, and will condemn him more severely than we ourselves could. For he will convict and will pass sentence upon himself, and will look for every pretext for repaying the share of long-suffering granted him with fuller measure.

So that if thou hast a wish to revenge thyself, revenge thyself in this manner. Return good for evil, that thou mayest render him even thy debtor, and achieve a glorious victory. Hast thou suffered evil? Do good; thus avenge thee of thine enemy. For if thou shalt go about to resent it, all will blame both thee and him alike. Whereas if thou shall endure it, it will be otherwise. Thee they will applaud and admire; but him they will reproach. And what greater punishment can there be to an enemy, than to behold his enemy admired and applauded by all men? What more bitter to an enemy, than to behold himself reproached by all before his enemy's face?

If thou openest thy mouth, they will be silent; but if thou art silent, not with one tongue only, but with ten thousand tongues of others, thou smitest him, and art the more avenged. And on thee indeed, if thou shalt reproach him, many again will cast imputations (for they will say that thy words are those of passion); but when others who have suffered no wrong from him thus overwhelm him with reproaches, then is the revenge especially clear of all suspicion. For when they who have suffered no mischief, in consequence of thy excessive forbearance feel and sympathize with thee, as though they had been wronged themselves, this is a vengeance clear of all suspicion.

Let us not then be revengeful, but let us quench our anger, that we may be counted worthy of the lovingkindness, which comes from God ("for with what measure," saith Christ, "ye mete, it shall be measured unto you, and with what judgment ye judge, ye shall be judged"), and that we may both escape the snares of this present life, and in the day that is at hand, may obtain pardon at His hands, through the grace and loving-kindness of our Lord Jesus Christ.