What does the Bible say about grace and works in salvation?

According to Romans 11:6, if salvation is by grace, then it cannot involve works. This distinction underscores the central Reformed understanding that human efforts are inadequate to meet the demands of God's law. Instead, salvation is purely by God's free grace, emphasizing His sovereign choice and mercy rather than human merit or will. Paul articulates this truth throughout Scripture, asserting that salvation is either completely God’s doing or man's doing, and cannot be a mix of the two. This fundamental principle is vital for understanding the nature of grace and the futility of works in securing salvation.