Origin of Creation - Verse 9-10

What is mentioned as the incomprehensible cause is Brahman which is the source of origin of the Prakrti, The individual unit is a synthesis of Atman, the cavity of the heart, womb, eye and the body. It is immortal and imperishable. The semen comprises the sattvaguna, penance and is very bright. That incomprehensible eternal second Purusa is pervaded by Brahma, the grandfather of the worlds.