Faith Overlooks Circumstances
Heb 11:11,12 By faith Abraham, even though he was past age— and Sarah herself was barren— was enabled to become a father because he considered him faithful who had made the promise. And so from this one man, and he as good as dead, came descendants as numerous as the stars in the sky and as countless as the sand on the seashore.
The faith that saves is the faith that perseveres through difficult circumstances. But faith is not presumptuous about what God has not promised. Many Christians will claim to believe many things of which God has not promised. They may claim that God has called them to do one thing, whereas God may not have called them to do that. They may claim the God has promised them something whereas in fact the Bible may have made no such promise.
But in Abraham's case, God spoke to him directly and promised him what was going to take place. Consequently his faith in God was tied up in his faith in the promise of God. While for a time there was some confusion about the method God would use or the way God would bring this about, "against all hope, Abraham in hope believed and so became the father of many nations, just as it had been said to him, 'So shall your offspring be.' Without weakening in his faith, he faced the fact that his body was as good as dead— since he was about a hundred years old— and that Sarah’s womb was also dead. Yet he did not waver through unbelief regarding the promise of God, but was strengthened in his faith and gave glory to God, being fully persuaded that God had power to do what he had promised. This is why 'it was credited to him as righteousness.'" Rom 4:18-22