सोऽस्यायमात्मा पुण्येभ्यः कर्मभ्यः प्रतिधीयते ।अथास्यायमितर आत्मा कृतकृत्यो वयोगतः प्रैति स इतः प्रयन्नेव पुनर्जायते तदस्य तृतीयं जन्म ॥ ४ ॥
In plain words
This self of his is set in place for meritorious deeds. Then this other self of his -- its task fulfilled, its years spent -- departs; and departing from here, going forth, he is born again. That is his third birth.