Why is it important for Christians to have their hearts established with grace?

A heart established with grace is crucial for spiritual stability as indicated in Hebrews 13:9, which warns against being carried away by diverse and strange doctrines. When believers' hearts are firmly rooted in the grace of God, they are less likely to be swayed by false teachings that can lead to spiritual instability. This stability reflects an understanding of the gospel, where salvation and justification are seen as gifts from God rather than achievements based on works. Ephesians 4:14 reinforces the need to grow in grace to avoid being tossed about by every wind of doctrine, emphasizing how foundational grace is in a believer's life.