John 12:6

6.Because he was a thief. The rest of the Apostles, not from any bad disposition, but thoughtlessly, condemn Mary. But Judas resorts to a plausible pretext for his wickedness, when he brings forward the poor, though he cared nothing about them. We are taught by this instance what a frightful beast the desire of possessing is; the loss which Judas thinks that he has sustained, by the loss of an opportunity for stealing, excites him to such rage that he does not hesitate to betray Christ. And probably, in what he said about the poor having been defrauded, he did not only speak falsely to others, but likewise flattered himself inwardly, as hypocrites are wont to do; as if the act of betraying Christ were a trivial fault, by which he endeavored to obtain compensation for the loss which he had sustained. He had but one reason, indeed, for betraying Christ; and that was, to regain in some way the prey which had been snatched from his hands; for it was the indignation excited in him, by the gain which he had lost, that drove him to the design of betraying Christ.

It is wonderful that Christ should have chosen, as a steward, a person of this description, whom he knew to be a thief. For what else was it than to put into his hands a rope for strangling himself? Mortal man can give no other reply than this, that the judgments of God are a deep gulf. Yet the action of Christ ought not to be viewed as an ordinary rule, that we should commit the care of the poor, or any thing sacred, to a wicked and ungodly man. for God has laid down to us a law, who they are that ought to be called to the government of the Church, and to other offices; and this law we are not at liberty to violate. The case was otherwise with Christ, who, being the eternal Wisdom of God, furnished an opportunity for his secret predestination in the person of Judas.