Bhagwad Gita
Chapter 10, Verse 10
तेषां सततयुक्तानां भजतां प्रीतिपूर्वकम्।
ददामि बुद्धियोगं तं येन मामुपयान्ति ते।।10.10।।
To those who are constantly devoted and worship Me with love, I give the understanding by which they can come to Me.