There are a couple more relevant quotes from
The Silmarillion.
Quote:
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In the powers and knowledge of all the other Valar [Melkor] had part, but he turned them to evil purposes and squandered his strength in violence and tyranny.
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Valaquenta
And this:
Quote:
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....[Morgoth's] hatred devoured him, and in the domination of his servants and the inspiring of them with lust of evil he spent his spirit.
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Of the Flight of the Noldor
Tolkien said of Sauron that he also wasted his own native power in domination of his servants. He certainly 'inspired' them with rage and hate as well. If that was the case with Sauron, servant of Melkor, it would have been many times more magnified in his master.