Dear Tbt Lord,
IMHO:
In this beautiful passage the source content has to be understood as water not the ocean. The source water must exist in some evanescent form like that of vapour spewing out of a tea pot, the liquid that stays as ocean, snow that dresses up the Himalayas and the cloud that covers the sky.
Likewise the
Cit assumes the form of the entire universe in all its diversities as seen as this, from the subtlest mind to the grossest matter.
Without the existence of the substance water none of these forms of water has validity, in the same sense, without the core substance
Cit, no world can exist; without these manifested forms, the Substance
Cit, cannot exist either.
The Eternal Substance and its fleeting apparent forms, the World, are thus inseparable; this has to be intuitively perceived by every careful seeker student.
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The method employed here is called
Yoga-Buddhi in Srimad. Bhagavad Gita, in which, an enlightened master, when communicating what is ineffable, points out two of its opposite expressible aspects, such as substance and attribute or self and non-self, leaving it to the seeker perceive it by his own, as the understanding of the Absolute is not possible by the usual didactic methods of learning and teaching which mostly based on pragmatic, empirical or common logical approach of theological order.
Good luck and Love
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