Yama, the first limb consists of five parts:
Only the actions of previous lives will lead us to practice them. The mind will turn itself to the practice of yoga only when a samskara or vasana is present. (it is believed that only an association with the practice of yoga in a past life will lead to its practice in the present life
Ahimsa: not causing injury to anyone, including animals - in any form, at any time, or for any reason. In word, thought or deed.
One should always tell the truth in thought, word and deed. The truth must be pleasant to others and an unpleasant truth should not be uttered. If one follows the truth in this manner, all one's words will become true and all one's desires will be fulfilled.
Asteya: not stealing the property or possessions of others. Being envious of or begruding another. Cheating someone with sweet words. Gaining selfish ends under the guise of truthfulness: all are to be abandoned.
Upon being established in brahmacharya, there is the attainment of vital energy.
Brahmacharya is very difficult nowadays because there are so many things that attract the mind in different directions: theaters, tv, restaurants, internet. But you still can achieve some degree of Brahmacharya. If he is to achieve it, he must avoid:
mixing with vulgar people
going to crowded areas for recreation
reading vulgar books which disturb the mind
going to theaters and restaurants
secretly conversing with strangers of the opposite sex.
Upon being established in brahmacharya, vital energy is obtained.
Moksha or mukti: spiritual liberation
Householders lose brahmacharya owing to seminal loss. With the loss, they lose the strength of their bodies, minds and sense organs. In addition, moksha and the capacity to perceive the soul or realize the true Self become impossible. In the absence of the knowledge of one's own Self, one remains in the cycle of birth and death, and thus must continue to suffer in this sapless and despicable world.
right one: surya nadi
left one: chandra nadi
Nayam atma balahinena labyah The Self cannot be gained by the weak
Aparigraha: the food we eat should be pure (sattvic), untainted (nirmala) and acquired through righteousness. Not be secured by cheating, deceit, persecution or other unjust means.
Only taking as much food as we need to maintain our bodies and not desiring things of enjoyment which are sueprfluous to the physical body, is aparigraha.
If the limb of aparigraha is firmly practiced, details of previous and future births are revealed.