Sāṃkhya Kārikā verse 35
śāntaḥ karaṇaṃ buddhiḥ sarvaṃ viṣayam avagāhate yasmāt | tasmāt trividhaṃ karaṇaṃ dvāri dvārāṇi śeṣāṇi ||
śānta - quiescentkaraṇa - making, effectingbuddhi - the intellectual faculty; comprehension; intelligence, discernment, judgementsarva - allviṣaya - an object of sense; anything perceptible by the senses; any object of affection or concern or attentionavagāhate - to be absorbed, absorbsyasmāt - from whichtasmāt - from that, on that account, thereforetrividha - three foldkāraṇa - reasons, causedvāri - doorkeeperdvārāṇi - the doors of the bodyśeṣa - remainder