In The Letters of J.R.R. Tolkien door Humphrey Carpenter (bijgestaan door Christopher Tolkien), staat in voetnoot 94:
What is meant is that it was Arwen who first thought of sending Frodo into the West, and put in a plea for him to Gandalf (direct or through Galadriel, or both), and she used her own renunciation of the right to go West as an argument. Her renunciation and suffering were related to and enmeshed with Frodo's : both were parts of a plan for the regeneration of the state of Men. Her prayer might therefore be specially effective, and her plan have a certain equity of exchange.
Ik kan me niet herinneren dat dit wordt genoemd in Lord of the Rings , zelfs niet in de bijlagen. Waar (in gepubliceerd of postuum materiaal) deed J.R.R. Tolkien maakt de rol van Arwen expliciet?