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; any object of affection or concern or attentiontasmāt - from that, on that account, thereforetrividha - three foldśeṣa - remainderkāraṇa - reasons, cause