6.17 Yogah bhavati, Yoga becomes; duhkha-ha, a destroyer of sorrow-that which destroys (hanti) all sorrows (duhkhani)-, i.e., Yoga destroys all worldly sorrows; yukta-ahara-viharasya, of one whose eating and movements are regulated- ahara (lit. food) means all that is gathered in, [According to the Commentator, ahara, which also means food, includes mental 'food as well. See Ch. 7.26.2.-Tr.] and vihara means moving about, walking; one for whom these two are regulated (yukta) is yukta-ahara-vihara-; and also yukta-cestasya, of one whose effort (cesta) is moderate (yukta); karmasu, in works; similarly, yukta-svapna-avabodhasya, of one whose sleep (svapna) and wakefulness (avabodha) are temperate (yukta), have regulated periods. To him whose eating and movements are regulated, whose effort in work is moderate, whose sleep and wakefulness are temperate, Yoga becomes a destroyer of sorrows. When does a man become concentrated? That is being presently stated: