Having discussed faith before the fulfillment, Mormon turns to faith in times after the fulfillment. No longer a faith that looked to the coming of Christ, faith acted to allow us to ask of the Father in prayer. It was now a personal unfulfillment that faith looked to work through. It similarly acted to allow us to understand that God exists, and is willing to answer our prayers.
The miracle of Christ’s atonement did not remove God from our lives, and did not remove our need for God’s merciful intervention in our lives. While Christ “answered the ends of the law, and he claimeth all those who have faith in him,” we are not to suppose that our relationship with the God of the heavens is any less, nor that miracles, big and small, cannot still happen among the children of men.