Römer 8:31

What shall we then say to these things?--"We can no farther go, think, wish" [BENGEL]. This whole passage, to Rom 8:34, and even to the end of the chapter, strikes all thoughtful interpreters and readers, as transcending almost every thing in language, while OLSHAUSEN notices the "profound and colossal" character of the thought. If God be for us, who can be against us?--If God be resolved and engaged to bring us through, all our enemies must be His; and "Who would set the briers and thorns against Him in battle? He would go through them. He would burn them together" (Isa 27:4). What strong consolation is here! Nay, but the great Pledge of all has already been given; for,

The apostle closes this excellent discourse upon the privileges of believers with a holy triumph, in the name of all the saints. Having largely set forth the mystery of God's love to us in Christ, and the exceedingly great and precious privileges we enjoy by him, he concludes like an orator: What shall we then say to these things? What use shall we make of all that has been said? He speaks as one amazed and swallowed up with the contemplation and admiration of it, wondering at the height and depth, and length and breadth, of the love of Christ, which passeth knowledge. The more we know of other things the less we wonder at them; but the further we are led into an acquaintance with gospel mysteries the more we are affected with the admiration of them. If Paul was at a loss what to say to these things, no marvel if we be. And what does he say? Why, if ever Paul rode in a triumphant chariot on this side of heaven, here it was: with such a holy height and bravery of spirit, with such a fluency and copiousness of expression, does he here comfort himself and all the people of God, upon the consideration of these privileges. In general, he here makes a challenge, throws down the gauntlet, as it were, dares all the enemies of the saints to do their worst: If God be for us, who can be against us? The ground of the challenge is God's being for us; in this he sums up all our privileges. This includes all, that God is for us; not only reconciled to us, and so not against us, but in covenant with us, and so engaged for us - all his attributes for us, his promises for us. All that he is, and has, and does, is for his people. He performs all things for them. He is for them, even when he seems to act against them. And, if so, who can be against us, so as to prevail against us, so as to…

8:31 such wonderful things: Paul is referring to everything he has taught in chs 5–8 about the blessings and sense of assurance that believers receive from their relationship with God.