Commentators explain that when the devil "put into the heart of Judas" the idea to betray Jesus, it wasn't a forced action. Instead, Satan exploited Judas's existing weakness—his love of money. Scholars like Calvin and Barnes clarify that while Satan tempts and suggests, the individual is still responsible for yielding to that temptation. This serves as a powerful reminder that our own sinful inclinations can provide an opening for evil if left unchecked.