Romans 4:18

18 Hoping against hope, he believed that he would become "the father of many nations," according to what was said, "So numerous shall your descendants be."

Romans 4:18 Meaning and Commentary

Romans 4:18

Who against hope believed in hope
Abraham believed the promise of God,

that he might become the father of many nations,
being assisted by a supernatural aid: "in hope"; of the fulfilment of it by the grace and power of God: "against hope": against all visible, rational grounds of hope; Sarah's womb and his own body being dead, but inasmuch as God had said it, he believed:

according to that which is spoken, so shall thy seed be;
his faith rested upon the word of God, which showed the nature of it, and that it was of the right kind.

Romans 4:18 In-Context

16 For this reason it depends on faith, in order that the promise may rest on grace and be guaranteed to all his descendants, not only to the adherents of the law but also to those who share the faith of Abraham (for he is the father of all of us,
17 as it is written, "I have made you the father of many nations")—in the presence of the God in whom he believed, who gives life to the dead and calls into existence the things that do not exist.
18 Hoping against hope, he believed that he would become "the father of many nations," according to what was said, "So numerous shall your descendants be."
19 He did not weaken in faith when he considered his own body, which was already as good as dead (for he was about a hundred years old), or when he considered the barrenness of Sarah's womb.
20 No distrust made him waver concerning the promise of God, but he grew strong in his faith as he gave glory to God,