Now what he is saying is somewhat of this kind. For if for a virtuous man, no one would hastily choose to die, consider your Master's love, when it is not for virtuous men, but for sinners and enemies that He is seen to have been crucified — which he says too after this, "In that, if when we were sinners Christ died for us," (Romans 5:9-10)
By saying that Christ died for us while we were yet sinners, Paul gives us hope that we will be saved through him, much more so now that we are cleansed from sin and justified against the wrath which remains for sinners. The One who so loved his enemies that he gave his only Son to die for us will surely be much readier to grant those who have received this gift and been reconciled to him the further gift of eternal life.
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 helpeth a brother shall be exalted; " and that the apostle also has said, "Let all of you severally have regard to yourselves, lest ye also be tempted. Bear ye 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 thinketh he standeth, take heed lest he fall; " and in another place he says, "Who art thou that judgest another man's servant? To his own master he standeth or falleth; 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 ye 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."
God becomes the object of love when he conveys how much he loves us. For when someone does something without obligation, one demonstrates love in a special way. And what would be less of an obligation than that a master who is without sin should die for his faithless servants, and that the Creator of the universe should be hanged for the sake of his own creatures? Note that when the apostle says that believers in Christ were once sinners he means that now they are no longer sinners, so that they may recall how they ought to behave.
[AD 407] John Chrysostom on Romans 5:6-8