Why is believing in Christ essential for entering His rest?

Belief in Christ is the only means by which one may enter into His rest, as emphasized in Hebrews 4:3, 'For we which have believed do enter into rest.' This belief is not merely intellectual assent but a heart commitment to trust in the sufficiency of Christ's sacrifice. By trusting Him, believers cease their striving to earn favor through their works. They rest in the grace provided by Jesus, which results in a profound internal peace that cannot be achieved through human effort. The text warns against the example of unbelief displayed by the Israelites, showing that only genuine faith can lead one to experience the fullness of God's promised rest.