Bhagwad Gita
Chapter 12, Verse 9
अथ चित्तं समाधातुं न शक्नोषि मयि स्थिरम्।अभ्यासयोगेन ततो मामिच्छाप्तुं धनञ्जय।।12.9।।
My dear Arjuna, O winner of wealth, if you cannot fix your mind upon Me without deviation, then follow the regulated principles of bhakti-yoga. In this way you will develop a desire to attain to Me.