Verse 28

ब्रह्मविष्ण्विन्द्ररुद्राणां कारणानां जगत्स्थितौ ।एतत्कारणमाद्यं तत्कारणं नास्य विद्यते

In plain words

Of Brahmā, Viṣṇu, Indra, and Rudra -- themselves causes in the standing of the world -- this is the first cause; and of this cause, no cause whatever exists.