According to p. 345 of Morgoth's Ring, note 11 in the Athrabeth Ah Finrod Andreth it is "the Creative activity of Eru" Iluvatar.
In another place i can't locate off the top of my head JRRT more explicitly identifies it w/ the Holy Spirit.
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The dwindling Men of the West would often sit up late into the night exchanging lore & wisdom such as they still possessed that they should not fall back into the mean estate of those who never knew or indeed rebelled against the Light.
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