What does the Bible say about works versus grace?

The Bible makes a clear distinction between salvation based on human works and that based on divine grace. Paul, in Romans 11, states that you cannot mix works of men with the will of God in Christ; they are enemies to one another. This is foundational in understanding how God operates in the covenant of grace, where salvation comes neither from legislative obedience nor human effort, but solely by the work of Christ. Genesis 21 illustrates this through the promise of Isaac, a child born not from human effort but from God's miraculous grace, reinforcing the doctrine that our standing before God is due to Him and not our efforts.