Bhagavad Gita Verse 6.25

क्रम-क्रमसे अभ्यास करता हुआ उपरतिको प्राप्त हो तथा धैर्ययुक्त बुद्धिके द्वारा मनको परमात्मामें स्थित करके परमात्माके सिवा और कुछ भी चिन्तन न करे|

Once one has completely given up all desires created from his imagination and once one has learned to mentally control all of his senses, one slowly and gradually becomes peaceful. A true Yogi with a steady intellect fixes his mind only on God and thinks of nothing else but the Lord.