Each of these may vary in a threefold way according to the mildness, medium state, or intensity of quickness or readiness with which the Yogin may apply the means of attaining Yoga. There are nine kinds of Yogins. Of these the best is he whose mind is most intensely engaged and whose practice is also the strongest. There is a difference of opinion here about the meaning of the word saṃvega, between Vācaspati and Vijñāna Bhikshu. The former says that saṃvega means vairāgya here, but the latter holds that saṃvega cannot mean vairāgya, and vairāgya being the effect of śraddhā cannot be taken separately from it. “Saṃvega” means quickness in the performance of the means of attaining Yoga; some say that it means “vairāgya.” But that is not true, for if vairāgya is an effect of the due performance of the means of Yoga, there cannot be the separate ninefold classification of Yoga apart from the various degrees of intensity of the means of Yoga practice. Further, the word “saṃvega” does not mean “vairāgya” etymologically (_Yoga-vārttika_, I. 20). We have just seen that śraddhā, etc., are the means of attaining Yoga, but we have not discussed what purificatory actions an ordinary man must perform in order to attain śraddhā, from which the other requisites are derived. Of course these purificatory actions are not the same for all, since they must necessarily depend upon the conditions of purity or impurity of each mind; thus a person already in an advanced state, may not need to perform those purificatory actions necessary for a man in a lower state. We have just said that Yogins are of nine kinds, according to the strength of their mental acquirements—śraddhā, etc.—the requisite means of Yoga and the degree of rapidity with which they may be applied. Neglecting division by strength or quickness of application along with these mental requirements, we may again divide Yogins again into three kinds: (1) Those who have the best mental equipment. (2) Those who are mediocres. (3) Those who have low mental equipment. In the first chapter of Yoga aphorisms, it has been stated that abhyāsa, the application of the mental acquirements of śraddhā, etc., and vairāgya, the consequent cessation of the mind from objects of distraction, lead to the extinction of all our mental states and to final release. When a man is well developed, he may rest content with his mental actions alone, in his abhyāsa and vairāgya, in his dhāraṇā (concentration), dhyāna (meditation), and samādhi (trance), which may be called the jñānayoga. But it is easy to see that this jñānayoga requires very high mental powers and thus is not within easy reach of ordinary persons. Ordinary persons whose minds are full of impurities, must pass through a certain course of purificatory actions before they can hope to obtain those mental acquirements by which they can hope to follow the course of jñānayoga with facility.