
“God is where you let Him in.”
This expression originates with a statement of Kotzker Rebbe, who, when he was five years old asked his father "Where is God?" to which his father answered: "God is everywhere!" Rebbe then responded "No, I think God is only where you let Him in." As quoted in Innerspace : Introduction to Kabbalah, Meditation and Prophecy (1990), by Aryeh Kaplan, p. 160.
Misattributed