How does human nature contribute to spiritual infiltration?

The human heart is naturally inclined towards sin, suggesting that spiritual infiltration can occur within the church when believers neglect to guard their hearts and minds against falsehood. Jude highlights that believers must recognize their ongoing struggle with the residual sin remaining even after salvation. Recognizing that spiritual battles are fought not just externally but within our hearts helps believers remain alert to the subtle ways in which sin can creep in under the guise of grace. By understanding and confronting their own vulnerabilities in light of God's Word, Christians can better prevent the infiltration of false teachings that might appeal to their sinful inclinations.