Tolkien's War on Evil

According to Tolkien, evil is immortal and all our victories against it in this world are temporary. We can only defeat the temporary bodily forms that evil uses: orcs or Nazgul or evil wizards. Even though black is mightier still, Gandalf the White triumphs over Sauron. Good as well as evil has a weight in the Lord of the Rings that surpasses any other book of the century. What other 20th century author could have written a passage like this one?