Faith binds man to Christ. Hope sets this faith open to the comprehensive future of Christ. Hope is therefore the ‘inseparable companion’ of faith. … Hope is nothing else than the expectation of those things for which faith has believed to have been truly promised by God… faith is the foundation upon which hope rests, hope nourishes and sustains faith.
To believe means to cross in hope and anticipation the bounds that have been penetrated by the raising of the crucified. If we bear this in mind, then this faith can have nothing to do with fleeing the world, with resignation and with escapism… Faith, wherever it develops into hope, causes not rest but unrest, not patience but impatience. It does not calm the unquiet heart, but is itself this unquiet heart in man. Those who hope in Christ can no longer put up with reality as it is, but begin to suffer under it, to contradict it. Peace with God means conflict with the world, for the goad of the promised future stabs inexorably into the flesh of every unfulfilled present… That we do not reconcile ourselves, that there is no pleasant harmony between us and reality, is due to our unquenchable hope. This hope keeps man unreconciled, until the great day of the fulfillment of the promises of God. It keeps him in that unresolved openness to world questions which has its origin in the promise of God in the resurrection of Christ and therefore be resolved only when the same God fulfills his promise. This hope makes the Christian church a constant disturbance in human society … It makes the church the source of continual new impulses towards the realization of righteousness, freedom and humanity here in the light of the promised future that is to come.
Quoted from Theology of Hope, pp. 20-22