Why is Judas Iscariot's betrayal significant?

The betrayal by Judas Iscariot is significant as it not only fulfills the prophetic scripture but also serves as a cautionary tale about the human heart's capacity for unfaithfulness. In John 6:70, Jesus referred to Judas as a devil among His chosen twelve, emphasizing the mystery of his character despite being in the presence of Christ. Judas's actions show that it is possible to be close to Christ and still turn away due to selfish desires, highlighting the warning for believers to examine their hearts. His story embodies the consequences of prioritizing worldly gain over spiritual truth, illustrating the grave danger that can occur when hearts are not wholly devoted to Christ.