Indeed, the mind is composed of finer elements, whereas the body is made of grossest elements, and that makes a great difference in activity. The higher the plane of existence, the more active one is; the lower the plane, the less are the activities. That is why the mind is naturally more active than the body. Therefore, if after toil rest is necessary, how much more does this apply to mind than to body! We usually rest our body at will whenever circumstances allow us to; we recline on a couch or in an armchair after corning back from the office or work, and at night we rest and go to sleep; but when do we give the mind a rest?