Bilbo and Frodo spare Gollum, Gollum is able to destroy the Ring by falling into the Cracks of Doom while Frodo fails to destroy it. Thus Frodo, who is overpowered by the evil of the Ring, is saved by what seems to be luck. The role of fate in The Lord of the Rings is contrasted sharply with the prominent role that Tolkien gives to personal choice and will. Frodo's voluntary choice to bear the Ring to Mordor is central to the plot of the whole story. Also important is Frodo's willing offer of the Ring to Gandalf, the hero Aragorn, and the Elf-lady Galadriel, and their conscious refusal of it, not to mention Frodo's final inability to summon the will to destroy it. Thus, both free will and fate play out throughout the story: from Sam's vision of old Gaffer Gamgee's wheelbarrow and the Scouring of the Shire in the Mirror of Galadriel, to Arwen Evenstar's choice of mortality. The Tolkien scholar Helen Lasseter Freeh notes that the longer version of the tale of Túrin Turambar in Unfinished Tales (the Narn i Hîn Húrin) contains a dialogue between the Dark Lord Morgoth, who is a fallen Vala, and the heroic but mortal Man Húrin about fate and providence. Despite his imprisonment, Húrin insists that Morgoth cannot control everything, and while Morgoth does not directly contradict this, he says he will spread a "cloud of Doom" on everyone Húrin loves, and "wherever they go, evil shall arise". Túrin lives a life of disaster, in which Freeh sees the hand of fate, which threatens to overwhelm Túrin's free will. Shippey comments that Morgoth is one of the Valar, whose power in the world appears as luck, or chance, or fate. Terrible things in the Narn seem to be coincidences; but, writes Shippey, Tolkien often gives "double explanations" of these events, one fate, one just accident. Proverbs and providence Shippey writes that the numerous proverbs in The Lord of the Rings lend weight to the subtle implications of the text's interlaced structure, which for much of the time leaves the reader, like the characters, unaware of what else is going on in Middle-earth. While the real-world proverbs are broadly neutral, although some remain optimistic or gloomy, the invented proverbs are, he suggests, closer to Tolkien's thought. So Théoden's "Oft evil will shall evil mar", Aragorn's "The hasty stroke goes oft astray", or