Romans 3:17

St. Augustine says, that by the law of actions, is understood, that which teaches us what we have to do: by the law of faith, is meant faith itself, which obtains for us grace of performing what the law requires. The law of action, then, is the old law, which contains the precept; the law of faith is the new law, which gives assistance to fulfil the law. (De Spir. & Lit. chap. iv.)