"Knowledge (Jnana) does not come about from practice of yoga methods alone. Perfection in knowledge is in fact only for those who begin by practice of virtue (dharma). Yet, without yoga as a means, knowledge does not come about. The practice of yogic methods is not the means by itself, yet it is only out of that practice of yoga that the perfection in knowledge comes about. And so it is said by the teachers: 'Yoga is for the purpose of knowledge of truth'" Thus wrote Shankara.