Bhagavatapurana 12.4.31.p1

12.4.31.p1

yathā ghano 'rka-prabhavo 'rka-darśito $ hy arkāṃśa-bhūtasya ca cakṣuṣas tamaḥ &

32. Just as a cloud born of the Sun exhibited by the Sun becomes the darkness that obscures the sight which is but an Amsa of the Sun, so also the Ahankara a product of Brahman lighted by

Brahman becomes an obstruction to Atman (Jiva), an amsa of Brahman, in realising Brahman.