A Quote from Baal HaSulam:
His operations did not come to be by many thoughts as is our way. That is He is One, Unique and Unified, and as He is Simple, so His Orot (Lights) extend from Him, namely Simple and Unified, without any multiplicity of forms, as it says, “My thoughts are not your thoughts, neither are your ways My ways.”

You must therefore understand and perceive that all the names and appellations, and all the Olamot (worlds), Upper and lower, are all one Ohr Pashut (Simple Light), Unique and Unified. In the Creator, the Ohr (Light) that extends, the thought, the operation and the operator and anything the heart can think and contemplate, are in Him one and the same thing.

Thus you can judge and perceive that this entire reality, Elyonim (Upper) and Tachtonim (Lower) as one in the final state of the end of correction, was emanated and created by a single thought. That single thought performs all the operations, is the essence of all the operations, the purpose and the essence of the labour. It is by itself the entire perfection and the sought-after reward, as the Ramban explained, “One, Unique and Unified.”

Baal HaSulam, Talmud Eser Sefirot, Part 1 – Histaklut Pnimit, item 8.

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