In my reading this time, I was drawn particularly to the theme of the Void, especially as it relates to Melkor/Morgoth. Consider the following quotes:
To Melkor among the Ainur had been given the greatest gifts of power and knowledge, and he had a share in all the gifts of his brethren. He had gone often alone into the void places seeking the Imperishable Flame; for desire grew hot within him to bring into Being things of his own, and it seemed to him that Iluvatar took no thought for the Void, and he [Melkor] was impatient of its emptiness.
But when they were come into the Void, Iluvatar said to them: 'Behold your Music!' And he showed to them a vision, giving to them sight where before was only hearing; and they saw a new World made visible before them, and it was globed amid the Void, and it was sustained therein but was not of it.
"Therefore I say: Ea! Let these things Be! And I will send forth into the Void the Flame Imperishable, and it shall be at the heart of the World, and the World shall Be."
Now, if I may be so bold as to skip all the way to the end of the tale, there is this VERY interesting quote:
But Morgoth himself the Valar thrust through the Door of Night beyond the Walls of the World, into the Timeless Void; and a guard is set for ever on those walls, and Earendil keeps watch upon the ramparts of the sky.
Isn't it interesting that the very thing for which Melkor was so concerned and had such great "impatience of its emptiness" becomes the very place in which he is imprisoned after all his misdeeds? VERY interesting!! Beware what you wish for, you just might get it!