Why is self-deception dangerous for Christians?

The narrative of James and John in Mark 10 shows how self-deception can manifest in a desire for prominence without understanding the cost associated with it. When they sought positions of honor, they demonstrated a lack of awareness of the suffering that Jesus was about to endure. This self-deception is dangerous as it leads individuals to overestimate their spiritual strength and understanding. It can result in pride, competition, and a failure to truly serve others, which are counter to the teachings of Christ. Recognizing our fallen nature and the importance of humility allows believers to align more closely with God's purposes for their lives.