Recollections are engendered by the past, insofar as the relevant experience has not been eclipsed. ||11||

शब्दज्ञानानुपाती वस्तुशून्यो विकल्पः ॥९॥

śabda-jñāna-anupātī vastu-śūnyo vikalpaḥ ॥9॥

Imaginings are engendered by word knowledge without regard for what actually exists in the real world. ||9||

Verse 10

अभावप्रत्ययाअलम्बना तमोवृत्तिर्निद्र ॥१०॥

abhāva-pratyaya-ālambanā tamo-vr‌ttir-nidra ॥10॥

Deep sleep is the absence of all impressions resulting from opacity in that which is mutable in human beings (chitta). ||10||

Verse 11

अनुभूतविषयासंप्रमोषः स्मृतिः ॥११॥

anu-bhūta-viṣaya-asaṁpramoṣaḥ smr‌tiḥ ॥11॥

Recollections are engendered by the past, insofar as the relevant experience has not been eclipsed. ||11||

PATANJALI YOGA SUTRAS