Bhagavad Gita: Attain highest perfection of transcendental happiness (Dhyana-yoga (Text 27 Ch 6))

Sri-bhagavan uvaca

prasanta-manasam hy enam
yoginam sukham uttamam
upaiti santa-rajasam
brahma-bhutam akalmasam

Meaning: The yogi whose mind is fixed on Me verily attains the highest perfection of transcendental happiness. He is beyond the mode of passion, he realizes his qualitative identity with the Supreme, and thus he is freed from all reactions to past deeds.

Bhagavad Gita: Attain highest perfection of transcendental happiness  (Dhyana-yoga (Text 27 Ch 6))