Bhagwad Gita
Chapter 7, Verse 21
यो यो यां यां तनुं भक्तः श्रद्धयार्चितुमिच्छति।
तस्य तस्याचलां श्रद्धां तामेव विदधाम्यहम्।।7.21।।
I am in everyone's heart as the Supersoul. As soon as one desires to worship the demigods, I make his faith steady so that he can devote himself to some particular deity.