Why is it important for Christians to be aware of sin's deceitfulness?

Being aware of the deceitfulness of sin is vital for Christians as it directly affects one’s relationship with God and overall spiritual health. Sin can harden hearts, making individuals less sensitive to the prompting of the Holy Spirit and less likely to respond to the Gospel. Familiarity with sin can lead to desensitization, resulting in spiritual lethargy. By recognizing sin’s subtleties, Christians can better guard against falling into habitual sin, ensuring they cultivate a tender heart receptive to God's truth. Therefore, regular self-examination and mutual exhortation within the body of Christ are necessary to resist the power of sin.