Nyāya Sūtras 92.4

92.4

asati praṇidhāne saṅkalpe cāsati suptavyāsaktamanasāṃ yad indriyārthasannikarṣād utpadyate jñānam, tatra manaḥsaṃyogo 'pi kāraṇam iti manasi kriyākāraṇaṃ vācyam iti/
yathaiva jñātuḥ khalv ayam icchājanitaḥ prayatno manasaḥ preraka ātmaguṇaḥ, evam ātmani guṇāntaraṃ sarvasya sādhakaṃ pravṛttidoṣajanitam asti, yena preritaṃ mana indriyeṇa sambadhyate/ tena hy apreryamāṇe manasi saṃyogābhāvāj jñānānutpattau sarvārthatāsya nivarttate/ eṣitavyaṃ cāsya guṇāntarasya dravyaguṇakarmakāraṇatvam, anyathā hi caturvidhānām aṇūnāṃ bhūtasūkṣmāṇāṃ manasāṃ ca tato 'nyasya kriyāhetor asambhavāt śarīrendriyaviṣayāṇām anutpattiprasaṅgaḥ//30//

In the absence of focused attention and in the absence of intention, regarding the cognition that arises from contact between a sense organ and an object in those who are asleep or whose minds are distracted, because the conjunction with the mind is also a cause therein, a cause of motion in the mind must be stated. Just as, indeed, this effort born of desire in the knower is a quality of the self that impels the mind, so also there exists in the self another quality born of activity and defect that accomplishes everything, impelled by which the mind is connected with a sense organ. For when the mind is not impelled by that, non-production of cognition would occur owing to the absence of conjunction, and its capacity to apprehend all objects would cease. And one must accept that this other quality is a cause of substances, qualities, and motions; otherwise, because no cause of motion other than that would be possible for the four kinds of atoms, the subtle elements, and minds, the consequence would be the non-production of bodies, sense organs, and objects.