Sloth is the great enemy -- the inspirer of cowardice, irresolution, self-pitying grief, and trivial, hairsplitting doubts. Sloth may also be a psychological cause of sickness. It is tempting to relax from our duties, take refuge in ill-health and hide under a nice warm blanket.
PatanjaliYoga is the cessation of the movements of the mind. Then there is abiding in the Seer's own form.
Patanjali