How do we know God's grace is sufficient for sanctification?

The sufficiency of God's grace in sanctification is affirmed in Hebrews 10:14, which states that by one offering, He has perfected forever them that are sanctified. This highlights that effectiveness relies on Christ's atoning work, not our efforts. Throughout Scripture, we see that it is the blood of Christ that cleanses us from sin, providing assurance that God's grace is enough to sanctify His people fully. Therefore, any belief that we can achieve holiness apart from His grace is contrary to the biblical teaching that our righteousness comes solely through faith in Christ.