"The idle body, and the idle brain, is the shop of the devil. If the sea moved not, it could not but putrefy. And if the body is not stirred and moved, it breeds diseases. Now the idle and slothful person is a sea of corruption. And when he is most idle, Satan is least idle, for then he is most busy to draw him to manifold sins.”

— William Perkins, A Treatise on the Vocations