My great-grandfather, who was a Hassidic Rebbe, was once driving along a country road.
The coachman saw an apple orchard, jumped out, and began to take some apples.
The Rebbe cried out, "You are being watched! You are being watched!"
The coachman did not linger a second—he jumped back in the carriage and drove the horses as fast as he could.
After a while, when they were a considerable distance away, he stopped and said, "But I did not see anybody watching!"
The Rebbe replied, "God is watching you."
–Rabbi Adin Steinsaltz
From the essay, "Good" in Simple Words by Rabbi Adin Steinsaltz