Why is it important that salvation is by grace through faith?

Salvation by grace through faith is crucial because it establishes the foundation of our assurance in the promises of God. As Romans 4:16 states, it is by faith that the promise might be sure to all the seed of Abraham, referring to the elect. If salvation were based on works, it would be uncertain and contingent upon human effort, which can never satisfy the demands of God's holiness. By relying solely on God's grace, our salvation is secure, rooted in the sufficiency of Christ's obedience and atoning sacrifice. Therefore, this understanding allows us to glorify God while acknowledging that salvation is entirely a work of His grace.