Verse 14

अयमेवाहमित्यस्या निशाया उदिते क्षये ।स्वयं सर्वगतः स्फारः स्वालोकः संप्रवर्तते

In plain words

When the waning of this night — the notion 'I am just this' — has come about, then of itself there arises a vast, all-pervading light of the self.