Śvetāśvatara Upaniṣad · 2..2
योनिं गृह्णाति योनिरप्यस्यां भवति योनिर्यमधितिष्ठति योनिर्यस्या आयतनं प्रविशति योन्या एवैष भवति तमीशानं विद्वांस एवाहुः
yoniṃ gṛhṇāti yonirapyasyāṃ bhavati yoniryamadhitiṣṭhati yoniryasyā āyatanaṃ praviśati yonyā evaiṣa bhavati tamīśānaṃ vidvāṃsa evāhuḥ
He takes the womb, He is the womb, He is the one who resides in the womb, He is the one who enters the place of the womb, He becomes that very one —Him, the Lord, the sages declare thus.
Yoni (womb/source) is not just the feminine but the receptive principle of all manifestation. Brahman is simultaneously the one who fertilizes, the womb, the one who resides in it, and the one who emerges from it. This apparent paradox expresses the simultaneity of the transcendent and the immanent. In our yoga practice, when we understand that our own existence is at once the product and the producer, limitation becomes freedom. The īśāna (Lord) does not govern from outside but is the inherent intelligence in every process of manifestation.