18 Moreover, we do not prejudge when the Lord is to be the judge; save that if He shall find the repentance of the sinners full and sound, He will then ratify what shall have been here determined by us. If, however, any one should delude us with the pretence of repentance, God, who is not mocked, and who looks into man's heart, will judge of those things which we have imperfectly looked into, and the Lord will amend the sentence of His servants; while yet, dearest brother, we ought to remember that it is written, “A brother that helps a brother shall be exalted;” and that the apostle also has said, “Let all of you severally have regard to yourselves, lest you also be tempted.
Bear one another's burdens, and so fulfil the law of Christ;” also that, rebuking the haughty, and breaking down their arrogance, he says in his epistle, “Let him that thinks he stands, take heed lest he fall;” and in another place he says, “Who are you that judgest another man's servant? To his own master he stands or falls; yea, he shall stand, for God is able to make him stand.” John also proves that Jesus Christ the Lord is our Advocate and Intercessor for our sins, saying, “My little children, these things write I unto you, that you sin not.
And if any man sin, we have an Advocate with the Father, Jesus Christ the Supporter: and He is the propitiation for our sins.” And Paul also, the apostle, in his epistle, has written, “If, while we were yet sinners, Christ died for us; much more, being now justified by His blood, we shall be saved from wrath through Him.”
Source: The Epistles of Cyprian (New Advent)