Why did he choose [Judas], and … make him steward? To show his perfect love and his mercy. [It was] also that our Lord might teach his church that, even if there are false teachers in it, it is nevertheless the true seat [of authority]. For the seat of Judas did not come to naught with the traitor himself. It was also [to teach] that, even if there are evil stewards, the stewardship itself is true. He therefore washed his feet, [those very feet] by means of which he had arisen and gone to [Jesus’] slayers. Jesus kissed the mouth of him who, by means of it, gave the signal for death to those who apprehended him. He reached out and gave bread into that hand that reached out and took his price, and sold him unto slaughter. Commentary on Tatian’s Diatesseron.