The word ‘Yoga’ comes from the Sanskrit root ‘Yuj’ which means ‘to join’. By the practice of yoga, the individual soul (jivatma) is united with the supreme soul (paramatma). Yoga means union with God. Then all samsara (cycle of birth and death) comes to an end.
Yoga kills all sorts of pain – miseries and tribulations. Yoga frees you from the samsaric wheel of birth and death. Yoga gives you various powers and liberation through j ana (self-knowledge). Therefore drink the elixir or nectar of immortality and become a yogi. “Tasmat Yogl bhava Arjuna,” Gita, Ch. VI-46. Union with God is the goal of human life. It is the be all and end all of our existence. It is the summum bonum.
The Lord (Isvara) of raja yoga is a special purusa (person) who is not affected by the five afflictions and the fruit of actions and desires. His name or symbol is Om. He is indicated by the mono-syllable OM. He is omnipotent, omniscient, omnipresent, etc.