It is mercy, not justice or courage or even heroism, that alone can defeat evil.
The Philosophy of Tolkien: The Worldview Behind the Lord of the RingsLiving by faith includes the call to something greater than cowardly self-preservation.
J.R.R. Tolkien 4-Book Boxed Set: The Hobbit and The Lord of the RingsWhile persistence offers no guarantees, it does give 'luck' a chance to operate.
The Road to Middle-Earth: How J.R.R. Tolkien Created A New Mythology