Against all hope, Abraham in hope believed and so became the father of many nations, just as he had been told, “So shall your offspring be.”
18. Who against hope, etc. If we thus read, the sense is, that when there was no probable reason, yea, when all things were against him, he yet continued to believe. And, doubtless, there is nothing more injurious to faith than to fasten our minds to our eyes, that we may from what we see, seek a reason for our hope.
Having observed when Abraham was justified by faith, and why, for the honour of Abraham and for example to us who call him father, the apostle here describes and commends the faith of Abraham, where observe, I. Whom he believed: God who quickeneth. It is God himself that faith fastens upon: other foundation can no man lay.
Commenting on Romans 4:17-22
And being not weak in faith,.... Abraham was not weak in the exercise of his faith, on the promise of God; nor was his faith weakened about the accomplishment of it, neither by the length of time after the promise was made, nor by the seeming insuperable difficulties of nature which attended it; for he considered not his own body now dead.