Why is God's sovereignty important for understanding grace?

Understanding God's sovereignty is fundamental to grasping the nature of grace. It assures us that God's grace is given according to His divine will, without any obligation to humanity. This sovereignty means that no entity can challenge God's decisions or revoke His grace, which is why believers can have full assurance of their salvation as stated in Romans 8:38-39. God's absolute authority reinforces the permanence and security of the grace He extends, cementing that salvation is entirely an act of God's will, overpowering any human limitations or failures.