Matthew 7:2

Besides, the Lord Himself demonstrates the manner in which He threatens such as judge: "For with what judgment ye judge, judgment shall be given on you." Thus He has not prohibited judging, but taught (how to do it).

Here one may think there is difficulty in what follows, With what judgment ye judge ye shall be judged. If we judge a hasty judgment, will God also judge us with the like? Or if we have measured with a false measure, is there with God a false measure whence it may be measured to us again? For by measure I suppose is here meant judgment. Surely this is only said, that the haste in which you punish another shall be itself your punishment. For injustice often does no harm to him who suffers the wrong; but must always hurt him who does the wrong. (De. Civ. Dei, xxi. 11.) Some say, How is it true that Christ says, And with what measure ye shall mete it shall be measured to you again, if temporal sin is to be punished by eternal suffering? They do not observe that it is not said the same measure, because of the equal space of time, but because of the equal retribution—namely, that he who has done evil should suffer evil, though even in that sense it might be said of that of which the Lord spoke here, namely of judgments and condemnations. Accordingly, he that judges and condemns unjustly, if he is judged and condemned, justly receives in the same measure though not the same thing that he gave; by judgment he did what was unjust, by judgment he suffers what is just.

But what He says may cause perplexity: For with what judgment ye judge, ye shall be judged; and with what measure ye mete, it shall be measured to you again. Is it the case, then, that if we shall judge any thing with a rash judgment, God will also judge rashly with respect to us? Or if we shall measure any thing with an unjust measure, is there with God also an unjust measure, according to which it shall be measured to us again? (for by the expression measure also, I suppose the judgment itself is meant.) By no means does God either judge rashly, or recompense to any one with an unjust measure; but it is so expressed, inasmuch as that very same rashness wherewith you punish another must necessarily punish yourself. Unless, perchance, it is to be imagined that injustice does harm in some way to him against whom it goes forth, but in no way to him from whom it goes forth; but nay, it often does no harm to him who suffers the injury, but it must necessarily do harm to him who inflicts it. For what harm did the injustice of the persecutors do to the martyrs? None; but very much to the persecutors themselves. For although some of them were turned from the error of their ways, yet at the time at which they were acting as persecutors, their wickedness was blinding them. So also a rash judgment frequently does no harm to him who is the object of the rash judgment; but to him who judges rashly, the rashness itself must necessarily do harm. According to such a rule, I judge of that saying also: Every one that strikes with the sword shall perish with the sword. For how many take the sword, and yet do not perish with the sword, Peter himself being an instance! But lest any should think that he escaped such punishment by the pardon of his sins (although nothing could be more absurd than to think that the punishment of the sword, which did not befall Peter, could have been greater than that of the cross, which actually befell him), yet what would they say of the malefactors who were crucified with our Lord; for both he who got pardon, got it after he was crucified, and the other did not get it at all? Or had they perhaps crucified all whom they had slain; and did they therefore themselves too deserve to suffer the same thing? It is ridiculous to think so. For what else is meant by the statement, For all they that take the sword shall perish with the sword, but that the…