Elihu wraps up his hypothetical example of God saving a man from death through a mediator. This pictures Christ in how the mediator speaks to both God and man while offering a sufficient ransom (himself) for sinners. Salvation in Christ is continually offered to us through God's Word and Sacraments but Elihu says God only saves us twice or thrice. Well, Christ was offered only once for all and every time we find salvation secured in repeated participation in Word and Sacrament, we go back to the same sacrificial act of Christ. The point is that there are a limited times God makes great moves toward our salvation (e.g. conversion) but we participate in these same things every time we receive salvation.