THE BLISS IS ATTAINED BY A PURE MIND UNITED WITH BRAHMAN
18. "When the perfectly controlled mind rests in the Self only, free from longing for the objects of desire, then it is said: “He is united, (Yogi)”
21. "When he (the Yogi) feels that infinite bliss which can be grasped by the (pure) intellect (Buddhi) and which transcends the senses, and, established wherein he never moves from the Reality. (Brahman)."
27. "Supreme bliss verily comes to this Yogi whose mind is quite peaceful, whose passion is quieted, who has become Brahman, and who is free from sin."
Bhagavad Gita Ch. VI