The fire of knowledge

II.42 santosāt anuttamah sukhalābhah “From contentment and benevolence of consciousness comes supreme happiness.’ Through cleanliness of the body, contentment is achieved. Together they ignite the flame of tapas [self-discipline/ burning zeal] propelling the sādhaka towards the fire of knowledge. This transformation, which indicates that the sādhaka is on the right path of concentration, enables him to look inward through Self-study (svādhāya) and then towards Godliness.” Yogācārya B.K.S. Iyengar, Light on the Yoga Sutras of Patañjali, translation and commentary on Sūtra II.42