St. Thomas Aquinas
“Chrysostom says (Hom. lxxxii in Matth.): ‘Judas was not converted while partaking of the sacred mysteries: hence on both sides his crime becomes the more heinous, both because imbued with such a purpose he approached the mysteries, and because he became none the better for approaching, neither from fear, nor from the benefit received, nor from the honor conferred on him.'”
Source: St. Thomas Aquinas, Summa Theologica