How do Christians deal with their sinful nature according to Psalm 140?

Psalm 140 illustrates the Christian's battle with their sinful nature by showing David's earnest petitions for deliverance from the 'evil man' — a metaphor for the internal struggle with sin. Believers are encouraged to recognize that the real battle is not just against external foes but against the destructive tendencies of their old nature. This acknowledgment prompts a dependence on God’s grace and strength to combat these desires and to seek His help in maintaining righteousness. Ultimately, this dependence reflects a healthy understanding of the need for Christ's righteousness to overcome sin.