Dhammapada 3.37
Those who bridle their mind which travels far, moves about alone, is without a body, and hides in the chamber (of the heart), will be free from the bonds of Mara (the tempter).
Those who bridle their mind which travels far, moves about alone, is without a body, and hides in the chamber (of the heart), will be free from the bonds of Mara (the tempter).