More from Jenson still on the theme of God’s future:
“… it is in the situation attributed to the patriarchs that faith, ‘the assurance of things hoped for … and not seen,’ emerges the decisive relation to God. Genesis’ story of Abraham is the story of a man living by promises. He is called to go he knows not where, to become an unspecified blessing to unidentified future nations. In response to this dubious prospect, ‘he believed the Lord,’ and the Lord certified such drastic future-openness as ‘righteousness,’ that is, as the right relationship to himself and the human community. At the climax of Abraham’s story, the Lord proposes to take from him even the historical possibility of the promise’s fulfillment, so that he may live by faith and nothing else.”
-Robert Jenson, Systematic Theology Vol. 1, 68.