Satyayaniya Upanishad

Satyayaniya Upanishad The mind alone is the cause of bondage and liberation of the people; (the mind) attached to the objects of the senses leads them to bondage; freed from the objects it leads them to liberation. (Thus) it has been declared. If that attachment of the mind of a person to the objects of the senses is directed towards Brahman, who shall not be liberated from bondage? The mind (chitta) alone is worldly life; hence it should be purified with effort. As the mind is, so he becomes. This is the eternal secret. Then indeed, Oh Brahmana, there are four kinds of ascetics, namely Kutichaka, Bahudaka, Hamsa and Paramahamsa. All these bear the signs of Vishnu (i.e. they strive for liberation), wear tuft and sacred thread, are pure in mind, consider their own Self as Brahman, are intent on worship (of God) in the form of pure consciousness, practise muttering of prayers and the principal and secondary disciplines (Yama and Niyama), are of good conduct and (thus) become exalted. The practice of yoga consists of the constant single-minded devoted service of Vishnu, the Guru; non-injuring by word, thought and deed is the devotional act of penance (tapoyajna).