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 settling of the mind into silence. When the mind has settled, we are established in our essential nature, which is unbounded Consciousness. Our essential nature is usually overshadowed by the activity of the mind.
Patanjali