Abraham was saved not by works but through faith alone. It’s called saving faith and is the instrument whereby God declares his people righteous and forgiven of their sins -- justified.
We’ll see three points on saving faith in the text:
Saving faith trusts God’s word, not our sight. V18
Saving faith can grow stronger resulting in worship as we consider our weakness, V19-21
Saving faith’s only object must be the risen Jesus. V23-25