What does the Bible teach about man's nature?

Scripture consistently portrays mankind as having a sinful nature, a theme culminating in the teachings of Christ in Mark 7. Jesus teaches that the heart is the source of defilement, indicating that our nature is corrupt. Additionally, passages like Romans 3:23 affirm that all have sinned and fall short of God’s glory. This underscores the necessity for redemption through Jesus Christ, who provides a new heart to those who believe, highlighting the grace of God as the solution to our sinful nature.