Shiva Purana
वायुरुवाच ॥ दिक्क्रियाव्यंजका विद्या कालो रागः प्रवर्तकः ॥ कालो ऽवच्छेदकस्तत्र नियतिस्तु नियामिका ॥ ३१ ॥
Vāyu said:— Vidyā (learning) that reveals the place and activity, time and passion these are the inducing agents. Time is the conditioning factor there; destiny is the controlling factor.
english translation
vAyuruvAca ॥ dikkriyAvyaMjakA vidyA kAlo rAgaH pravartakaH ॥ kAlo 'vacchedakastatra niyatistu niyAmikA ॥ 31 ॥
hk transliteration by Sanscript