Verse 37

यथा मणिर्ददात्यात्मच्छायाः स्वयमकारणम् ।तेजोमयीस्तथैवायमात्मा सृष्टीः प्रयच्छति

In plain words

As a gem, causelessly, gives forth of itself its own luminous reflections, so too does this Self bring forth its creations.