How do we know salvation is truly by grace?

The doctrine of grace teaches that our salvation is not conditioned upon anything we have done or will do. It is solely based on God's mercy and grace, as seen in Romans 9:11-16, which emphasizes that the purpose of God according to election stands, not of works but of Him who calls. This demonstrates God's sovereign decision to save whom He wills, assuring us that salvation is a gift extended to the undeserving. As such, our assurance rests not in our actions but in God's unchanging character and promises.