Nature
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That reference is specifically to the Lord of the Universe, and infers that He is self-begotten: Not birthed from the creation, but inherently Creator.
Without changing the meabning, one can approach it differently: "Nature," though most commonly meaning Assiah, is a common word for that which comes from Yetzirah, the World of Formation. In that sense, the phrase just means that the object of adoration is from a higher world than Yetzirah.