5 What is it then? I would not that you all who approach the Lord's Table which is in this life, should be with the many who are to be shut out, but with the few who are to be reserved. And how shall you be able to attain to this? Take “the wedding garment.” You will say, “Explain this 'wedding garment' to us.” Without a doubt, that is the garment which none but the good have, who are to be left at the feast, reserved unto that other feast to which no bad man approaches, who are to be brought safely there by the grace of the Lord; these have “the wedding garment.”
Let us then, my Brethren, seek for those among the faithful who have something which bad men have not, and this will be “the wedding garment.” If we speak of sacraments, you see how that these are common to the bad and good. Is it Baptism? Without Baptism it is true no one attains to God; but not every one that has Baptism attains to Him. I cannot therefore understand Baptism, the Sacrament itself that is, to be “the wedding garment;” for this garment I see in the good, I see in the bad.
Peradventure it is the Altar, or That which is received at the Altar. But no; we see that many eat, and “eat and drink judgment to themselves.” What is it then? Is it fasting? The wicked fast also. Is it running together to the Church? The wicked run there also. Lastly, is it miracles? Not only do the good and bad perform them, but sometimes the good perform them not. See, among the ancient people Pharaoh's magicians wrought miracles, the Israelites did not; among the Israelites, Moses only and Aaron wrought them; the rest did not, but saw, and feared, and believed. Were the magicians of Pharaoh who did miracles, better men than the people of Israel who could not do them, and yet that people were the people of God.
In the Church itself, hear the Apostle, “Are all prophets? Have all the gifts of healing? Do all speak with tongues?”
Source: Sermons on Selected Lessons of the New Testament (New Advent)