Faith calls upon us to believe substance and evidence that we cannot see. This is very challenging to our natural mind apart from faith in God. God oftentimes calls upon us to believe God even in spite of what might seem to us as impossible. Abraham was called by God to believe the impossible, to believe that God could give him a son when the deadness of Sarah’s womb and his own ability told him that was impossible. But against hope, Abraham still believed in hope, believing by strong faith that what God had promised he was able to perform.