Yama, Niyama, Âsana, Prânâyâma, Pratyâhâra, Dhârâna, Dhyâna, and Samâdhi are the steps in Raja-Yoga, of which non-injury, truthfulness, non-covetousness, chastity, not receiving anything from another are called Yama. This purifies the mind, the Chitta. Never producing pain by thought, word, and deed, in any living being, is what is called Ahimsâ, non-injury. There is no virtue higher than non-injury. There is no happiness higher than what a man obtains by this attitude of non-offensiveness, to all creation. By truth we attain fruits of work. Through truth everything is attained. In truth everything is established. Relating facts as they are — this is truth. Not taking others' goods by stealth or by force, is called Asteya, non-covetousness. Chastity in thought, word, and deed, always, and in all conditions, is what is called Brahmacharya. Not receiving any present from anybody, even when one is suffering terribly, is what is called Aparigraha. The idea is, when a man receives a gift from another, his heart becomes impure, he becomes low, he loses his independence, he becomes bound and attached.