9 For this have I at various times called to your remembrance, Beloved, and I confess to you it astonishes me much in the Scriptures of God, and I ought repeatedly to call your attention to it. I pray you to think of what our Lord Jesus Christ Himself says, that at the end of the world, when He shall come to judgment, He will gather together all nations before Him, and will divide men into two parts; that He will place some at His right hand, and others on His left; and will say to those on the right hand, “Come, you blessed of My Father, receive the kingdom prepared for you from the foundation of the world.”
But to those on the left, “Depart ye into everlasting fire, prepared for the devil and his angels.” Search out the reasons either for so great a reward, or so great a punishment. “Receive the kingdom,” and “Go into everlasting fire.” Why shall the first receive the kingdom? “For I was an hungred, and you gave Me meat.” Why shall the other depart into everlasting fire? “For I was hungry, and you gave Me no meat.” What means this, I ask? I see touching those who are to receive the kingdom, that they gave as good and faithful Christians, not despising the words of the Lord, and with sure trust hoping for the promises they did accordingly; because had they not done so, this very barrenness would not surely have accorded with their good life.
For it may be they were chaste, no cheats, nor drunkards, and kept themselves from evil works. Yet if they had not added good works, they would have remained barren. For they would have kept, “Depart from evil,” but they would not have kept, “and do good.” Notwithstanding, even to them He does not say, “Come, receive the kingdom,” for you have lived in chastity; you have defrauded no man, you have not oppressed any poor man, you have invaded no one's landmark, you have deceived no one by oath.
He said not this, but, “Receive the kingdom, because I was an hungred, and you gave Me meat.” How excellent is this above all, when the Lord made no mention of the rest, but named this only! And again to the others, Depart ye into everlasting fire, prepared for the devil and his angels. How many things could He urge against the ungodly, were they to ask, “Why are we going into everlasting fire!” Why? Do ye ask, you adulterers, menslayers, cheats, sacrilegious blasphemers, unbelievers. Yet none of these did He name, but, “Because I was hungry, and you gave Me no meat.”
Source: Sermons on Selected Lessons of the New Testament (New Advent)