Here is the Sanskrit anuvad, Hindi anuvad, and English translation of Atma-Samyama Yoga Chapter 6, Verse 6.12.
Sanskrit
तत्रैकाग्रं मनः कृत्वा यतचित्तेन्द्रियक्रियः । उपविश्यासने युञ्ज्याद्योगमात्मविशुद्धये ॥ ६.१२ ॥
Hindi
उस आसनपर बैठकर चित्त और इन्द्रियोंकी क्रियाओंको वशमें रखते हुए मनको ए करके अन्तःकरणकी शुद्धिके लिये योगका अभ्यास करे|
English
He should then practice Yoga for the purpose of purifying his mind and soul, focusing his thoughts on one point (God) at all times, and fully controlling the function of mind and senses.