Bent Out of Shape: The Ring of Power and the Wraithing of Humanity.

It runs against human nature to reject an advantage once we have it, but that’s what Tolkien’s heroes do again and again. It seems natural to long to wield power and to have great authority, but Tolkien uses a Ring and a concept—wraithing—to warn us against the terrible, corrupting force of absolute power.

Also

“And here is where I take a brief aside and beg you to please read the books if you have only seen the movies, because Peter Jackson utterly destroyed Faramir’s character in the movie.”

See Tolkien vs. Jackson: Differences Between Story and Screenplay. For myself, I had read LOTR many times before seeing the first movie. Hence when seeing the movies my mind automatically filled in the parts Jackson omitted, and corrected those he changed. The books come first, in more than one way.