What are the consequences of frustrating God's grace?

The consequences of frustrating God's grace are severe, as it effectively denies the sufficiency of Christ's atonement. To say that any aspect of salvation relies on human merit is to declare that Christ's death was in vain, which is the ultimate offense against God. Galatians 2:21 warns that if we attempt to attain righteousness through the law, then we nullify the grace of God. This is a serious matter that undermines the entirety of the Gospel, robbing God of His glory and elevating human effort instead of divine grace.