How do we know the concept of a true heart is important for Christians?

The concept of a true heart is vital for Christians because it signifies genuine faith that acknowledges Christ's finished work on the cross. In Hebrews 10:22, believers are called to 'draw near with a true heart in full assurance of faith', which emphasizes the necessity of relying on Christ for righteousness rather than on personal efforts or self-righteousness. A true heart understands and embraces that salvation is by grace alone, and as such, enables believers to hold fast to their faith without wavering. This true heart transforms their perspective, moving them from a works-based mindset to one that fully rests in the completed work of Christ, ensuring confidence in their standing before God.