How do we know God's covenant with His people is effective?

Isaiah 59:21 illustrates that God's covenant with His people is characterized by divine assurance. It is not conditioned upon human behavior but is guaranteed by His faithfulness and the redemptive work of Jesus Christ. This covenant embodies the grace that leads to salvation, revealing that it is God who initiates and secures our redemption. The text reveals that the Spirit and His words would not depart from the faithful, indicating the enduring nature and effectiveness of God's promises, regardless of human shortcomings.