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In plain words
Among these Kośas, Vijñānamaya possesses Jñāna-Śakti and is of the form of the agent; Manomaya possesses Icchā-Śakti and is of the form of the instrument; Prāṇamaya possesses Kriyā-Śakti and is of the form of the effect. This division is described according to fitness. Together these three Kośas are called the Sūkṣma-śarīra.