By cleanliness, disinclination to one's own body, and cessation of contact with others.
Pleasure in the world of desires, pleasure is in heaven. But the suppression of desires is the greatest joy.
Samadhi, the trance is attained by making Ishwara the motive of all actions.
When asana is mastered, the yogi is not disturbed by the pair of dualities; the opposite conditions.
The fourth is that which follows when the spheres of external and internal have been passed.
The mind becomes fit for the practice of dharana by the practice of pranayama.