Essence of Gita ||238||

1The God said: -O Arjuna, O thou the son of Pritha, rules of self-control, rules of penitence, posture, Pranayama, abstraction of the mind from the external lord, meditation, comprehension.
2And Samadhi (psychic trance) are the eight essential components of Yoga, which leads to liberation.
3Cessation of all killing or hurtful inclinations to all creatures and at all times is the highest virtue; compassion spells as the highest bliss. An animal duly killed on the celebration of a religious sacrifice is not killed at all. Speak what is true and pleasant.
4Cease to communicate an unpleasant truth, nor a pleasant untruth; this is the eternal virtue.
5Acquisition of a thing by stealing or force is called Steyam, the contrary of this leads to virtue.
6Renuciation of sexual intercourse at all times and under all circumstances, whether in mind, speech or act, is called Brahmacaryam.
7Non-acceptance of gifts even in moments of peril and a studious renunciation thereof is called Aparigraha.
8Purification, which is either external or internal, may be affected either with the help of earth and water, or by purifying the thoughts of one’s mind. Contentment is resting happy with whatsoever is easily obtained without solicitation.
9-10Tapas consists in concentrating the mind and the senses to any particular object, or in bringing about the emaciation or the body by practising Candrayanan, and Kriccha Candrayanam penances. The inner purification of a person effected by reciting the Pranava, Sata Rudriya and Vedanta texts is called Svadhyayam.
11-12An undiviating faith in the god Harl, with performances of rites enumerated in the (Srutis and Smritis, is called divine contemplation. Svastikas cross Padmasanam, etc., are the different postures (Asanas) of Yoga; the Vishnu which courses in the organism of a person is called Prana (life) and Pranayama consists in checking the outflow of breath.
13-15O Pandava, Pratyahara consists in restraining the mind and the senses from wandering among the unreal objects of the external world. Meditation (Dhyanam) consists in meditating upon the self of Brahma, whether embodied or disembodied. The embodied Self of Brahma should be meditated upon at the outset of Yoga, while the disembodied Brahma should be contemplated in its later stage, with the acquisition of increased psychic power.
16The knowledge that I am the supreme Brahma represents the state of Samadhi, the speech, the knowledge, the perception that ‘I am Brahma’ lead to emancipation.