As for the means employed by classical yoga there can be no question of reviewing them here. We must, to begin with, insist on their extreme seriousness, which gives food for thought.
At their basis are ‘curbs’ and ‘disciplines’ such as non-violence (ahimsa) and chastity. In the logical scheme of yoga these are only the preliminary dispositions for entry upon the Royal Way itself. It is generally said of them that they are not peculiar to yoga but common to all spiritual codes of conduct, that the equivalent is to be found in Christian asceticism. This is certainly true in principle. But why is it that, except for rare exceptions, they can scarcely be said to transform man in our Christian West, whereas they seem in general much more effective among the Indian adepts of yoga? It is to these simple ‘curbs’ and ‘disciplines that classical doctrine attributes the most extraordinary ‘powers ‘. For instance the normal effect, perhaps topical enough, of ahimsa is to make a man so peaceful that animals, instead of running away from him or attacking him, feel the radiance of his goodwill and gentleness and come to him; the true practitioner of non-violence meditates quietly in the jungle.