94 It is not then everyone who can say, “The Lord is my portion.” The covetous man cannot, for covetousness draws near and says: You are my portion, I have you in subjection, you have served me, you have sold yourself to me with that gold, by that possession you have adjudged yourself to me. The luxurious man says not: Christ is my portion, for luxury comes and says: You are my portion, I made you mine in that banquet, I caught you in the net of that feast, I hold you by the bond of your gluttony. Do you not know that your table was more valued by you than your life? I refute you by your own judgment, deny if you can, but you can not. And in fine you have reserved nothing for your life, you have spent it all for your table. The adulterer cannot say: “The Lord is my portion;” for lust comes and says: I am your portion, you bound yourself to me in the love of that maiden, by a night with that harlot you have come under my laws and into my power. The traitor cannot say: “Christ is my portion,” for at once the wickedness of his sin rushes on him and says: He is deceiving You, Lord Jesus, he is mine.
Source: Letters (New Advent)