Matthew 7:5

"Thou hypocrite, first cast out the beam out of thine own eye." Here His will is to signify the great wrath, which He hath against them that do such things. For so, wheresoever He would indicate that the sin is great, and the punishment and wrath in store for it grievous, He begins with a reproach. As then unto him that was exacting the hundred pence, He said in His deep displeasure, "Thou wicked servant, I forgave thee all that debt;" even so here also, "Thou hypocrite." For not of protecting care comes such a judgment, but of ill will to man; and while a man puts forward a mask of benevolence, he is doing a work of the utmost wickedness, causing reproaches without ground, and accusations, to cleave unto his neighbors, and usurping a teacher's rank, when he is not worthy to be so much as a disciple. On account of this He called him "hypocrite." For thou, who in other men's doings art so bitter, as to see even the little things; how hast thou become so remiss in thine own, as that even the great things are hurried over by thee? "First cast out the beam out of thine own eye." Seest thou, that He forbids not judging, but commands to cast out first the beam from thine eye, and then to set right the doings of the rest of the world? For indeed each one knows his own things better than those of others; and sees the greater rather than the less; and loves himself more than his neighbor. Wherefore, if thou doest it out of guardian care, I bid thee care for thyself first, in whose case the sin is both more certain and greater. But if thou neglect thyself, it is quite evident that neither dost thou judge thy brother in care for him, but in hatred, and wishing to expose him. For what if he ought to be judged? it should be by one who commits no such sin, not by thee. His injunction therefore in these words is as follows, that he who is chargeable with countless evil deeds, should not be a bitter censor of other men's offenses, and especially when these are trifling. He is not overthrowing reproof nor correction, but forbidding men to neglect their own faults, and exult over those of other men. For indeed this was a cause of men's going unto great vice, bringing in a twofold wickedness. For he, whose practice it had been to slight his own faults, great as they were, and to search bitterly into those of others, being slight and of no account, was spoiling himself two ways: first, by thinking lightly of his own faults; next, by incurring enmities and feuds with all men, and training himself every day to extreme fierceness, and want of feeling for others.

(Serm. in Mont. ii. 19.) When then we are brought under the necessity of finding fault with any, let us first consider whether the sin be such as we have never had; secondly that we are yet men, and may fall into it; then, whether it be one that we have had, and are now without, and then let our common frailty come into our mind, that pity and not hate may go before correction. Should we find ourselves in the same fault, let us not reprove, but groan with the offender, and invite him to struggle with us. Seldom indeed and in cases of great necessity is reproof to be employed; and then only that the Lord may be served and not ourselves. (Serm. in Mont. ii. 19.) For to reprove sin is the duty of the good, which when the bad do, they act a part, dissembling their own character, and assuming one that does not belong to them. (ubi sup.) For having removed from our own eye the beam of envy, of malice, or hypocrisy, we shall see clearly to cast the beam out of our brother's eye.

Otherwise; How sayest thou to thy brother; that is, with what purpose? From charity, that you may save your neighbour? Surely not, for you would first save yourself. You desire therefore not to heal others, but by good doctrine to cover bad life, and to gain praise of learning from men, not the reward of edifying from God, and you are a hypocrite; as it follows, Thou hypocrite, cast first the beam out of thine own eye.

He speaks of such as though themselves guilty of mortal sin, do not forgive a trivial fault in their brother.