"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; and those of you that will may go down into it.' And suddenly the Ainur saw afar off a light, as it were a cloud with a living heart of flame; and they knew this was no vision only, but that Iluvatar had made a new thing: Ea, the World that Is." -The Silmarillion, Ainulindale
"Therefore Iluvatar gave to their vision Being, and set it amid the Void, and the Secret Fire was sent to burn at the heart of the World; and it was called Ea." -The Silmarillion, Valaquenta
I'll try to find the references, but the greater part of Melkor's evil was driven by a desire to posess the fire and make creations of his own. Ultimately he could only twist and pervert what others made.
Interesting parallel to the desire and actions of Satan.