9 Now he who has been counted worthy of the heavenly calling, and by this calling has been sanctified, if he grow negligent in it, although washed becomes defiled: 'counting the blood of the covenant by which he was sanctified a profane thing, and despising the Spirit of grace,' he hears the words, 'Friend, how did you come in hither, not having wedding garments?' For the banquet of the saints is spotless and pure; 'for many are called, but few chosen. ' Judas to wit, though he came to the supper, because he despised it went out from the presence of the Lord, and having abandoned his Life, hanged himself.
But the disciples who continued with the Redeemer shared in the happiness of the feast. And that young man who went into a far country, and there wasted his substance, living in dissipation, if he receive a desire for this divine feast, and, coming to himself, shall say, 'How many hired servants of my father have bread to spare, while I perish here with hunger!' and shall next arise and come to his father, and confess to him, saying, 'I have sinned against heaven and before you, and am not worthy to be called your son; make me as one of your hired servants;'— when he shall thus confess, then he shall be counted worthy of more than he prayed for.
For the father does not receive him as a hired servant, neither does he look upon him as a stranger, but he kisses him as a son, he brings him back to life as from the dead, and counts him worthy of the divine feast, and gives him his former and precious robe. So that, on this account, there is singing and gladness in the paternal home.
Source: Letters (New Advent)