Tolkien's reflection on Frodo's failure to destroy the Ring will always live with me.
"Frodo undertook his quest out of love – to save the world he knew from disaster at his own expense, if he could; and also in complete humility, acknowledging that he was wholly inadequate to the task. His real contract was only to do what he could, to try to find a way, and to go as far on the road as his strength of mind and body allowed. He did that. I do not myself see that the breaking of his mind and will under demonic pressure after torment was any more a moral failure than the breaking of his body would have been – say, by being strangled by Gollum, or crushed by a falling rock."