The materials I've posted are not the 'Tolkien's Arda' of the First Making, but about what Tolkien might have meant for a second making: it's an interpolation of what Eru meant:
Quote:
thou, Melkor, shalt see that no theme may be played that hath not its uttermost source in me, nor can any alter the music in my despite. For he that attempteth this shall prove but mine instrument in the devising of things more wonderful, which he himself hath not imagined
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I.e. stop trying to 'defeat' the other. Melkor as the 'evil other' and from Melkor's point of view, the Valar as the--what--'good other'? And an implication of Eru's final ideas in the Music of the Ainur, when Arda is broken and remade.