If “all the promises of God find their Yes in [Jesus],” then to trust him now in the present is to believe that his promises will come true.
Those are not two separate faiths — trusting him, and believing in his promises. Trusting Jesus — believing in Jesus for salvation — means believing that he keeps his word. Being satisfied in the crucified and risen Jesus includes the belief that at every future moment, to all eternity, nothing will separate us from his love, or keep him from working all things together for our good. And that “good” is ultimately seeing and savoring the beauty and worth of God in Christ as our supreme Treasure.
The confidence that this all-satisfying good will be there for us forever is based on all the glorious grace of the past, especially the grace that God did not spare his own Son but gave him up for us all (Romans 8:32).
We need to taste now the spiritual beauty of God in all his past achievements — especially the death and resurrection of Christ for our sins — and in all his promises. Rooted in this past grace, our confidence and trust lay hold on all that God himself will be for us in the next moment, and in the next month, and in the endless ages of eternity.
It is he and he alone who will satisfy the soul in the future. And we must be sure of this future, if we are to live the radical Christian lives that Christ calls us to live here and now.
If our present enjoyment of Christ now — our present faith — does not have in it the Yes to all God’s promises, it will not embrace the power for radical service in the strength that God (in every future moment) will supply (1 Peter 4:11).
My prayer is that reflecting like this on the nature of faith in future grace will help us avoid superficial, oversimplified statements about believing the promises of God. It is a deep and wonderful thing.