सा भावयित्री भावयितव्या भवति तं स्त्री गर्भं बिभर्ति सोऽग्र एव कुमारं जन्मनोऽग्रेऽधिभावयति ।स यत्कुमारं जन्मनोऽग्रेऽधिभावयत्यात्मानमेव तद्भावयत्येषां लोकानां सन्तत्या एवं सन्तता हीमे लोकास्तदस्य द्वितीयं जन्म ॥ ३ ॥
In plain words
She, the nourisher, is to be nourished. The woman bears the embryo; and he -- even at the very beginning, before its birth -- nourishes the boy. In nourishing the boy before his birth, he nourishes indeed his own self, for the continuity of these worlds; for it is by such continuity that these worlds are kept unbroken. That is his second birth.