Study a single sutra by selecting the pada (chapter) and then the sutra (verse).
Source: How to Know God: The Yoga Aphorisms of Patanjali (Swami Prabhavananda, Christopher Isherwood)
As the result of mortification, impurities are removed. Then special powers come to the body and the sense-organs.
Source: English translation of the Yoga Sutras of Patanjali (Swami Jnaneshvara Bharati)
hrough ascesis or training of the senses (tapas), there comes a destruction of mental impurities, and an ensuing mastery or perfection over the body and the mental organs of senses and actions (indriyas).