Sāṃkhya Kārikā verse 33

antaḥ karaṇaṃ trividhaṃ daśadhā bāhyaṃ trayasya viṣayākhyam |
sāmpratakālaṃ bāhyaṃ trikālam ābhyantaraṃ karaṇam ||

antar - internalkaraṇa - making, effectingtri - threedasa - tendhā - putting, placingbāhya - externaltraya - the threeviṣaya - an object; any object of affection or concern or attentionprati - with regard tokāla - time, a period of time; season, the proper time or season forābhyantara - internalkāraṇa - reasons, cause