Why are Shiva and Divine Energy (Shakti) considered as inseparable?

Shakti is the dynamic power of Siva through which he manifests the worlds and their myriad objects and beings. Adinath Shiva Himself is the ultimate truth, is Self-radiant, Self-conscious, infinite, immortal, beyond the manifest and unmanifest and duality and non-duality. This Shiva principle also comprises of Divine Energy; but this Energy is not distinct from Shiva, She is incorporated in Him. She is responsible for creation, sustenance and dissolution of the universe. The nature of ths Energy is continuous activity which at times extends from the gross to the subtle and at other times from the manifest to the unmanifest. The cycle of the universe continues due to the progress or regression of this Energy. Shiva along with Energy is the support of the embodied soul (pinda) and the universe (Brahmanda).