Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 60
Sanskrit:
तस्मात् सर्वात्मना तात निगृहाण मनो धिया ।मय्यावेशितया युक्त एतावान् योगसङ्ग्रह: ॥ ६० ॥
ITRANS:
tasmāt sarvātmanā tātanigṛhāṇa mano dhiyāmayy āveśitayā yuktaetāvān yoga-saṅgrahaḥ
Translation:
My dear Uddhava, fixing your intelligence on Me, you should thus completely control the mind. This is the essence of the science of yoga.