Shiva Purana
प्रकाशश्चिच्च मिथुनं जगत्कारणतां गतम् ॥ सच्चिदात्मन्यपि तथा जगत्कारणतां गतम् ॥ २८ ॥
The pair of light and light have become the cause of the universe. Even in the true Self it has thus become the cause of the universe.
english translation
prakAzazcicca mithunaM jagatkAraNatAM gatam ॥ saccidAtmanyapi tathA jagatkAraNatAM gatam ॥ 28 ॥
hk transliteration by Sanscript