Bhūtasarga-Prakaraṇa
Account of Elemental Creation from Avyakta to Mahat
तस्यात्मना सर्वमिदं व्याप्तमासीत्तमोमयम् / गुणसाम्ये तदा तस्मिन्नविभातं तमोमयम्
tasyātmanā sarvamidaṃ vyāptamāsīttamomayam / guṇasāmye tadā tasminnavibhātaṃ tamomayam
By Its own Self, all this was pervaded as darkness (tamas); when the guṇas were in equilibrium then, nothing shone forth—everything was tamasic.