Bhagavad Gita Chapter 6 Verse 21
भगवद् गीता अध्याय 6 श्लोक 21

सुखमात्यन्तिकं यत्तद्बुद्धिग्राह्यमतीन्द्रियम्।
वेत्ति यत्र न चैवायं स्थितश्चलति तत्त्वतः।।6.21।।



English Translation - Swami Sivananda
6.21 When he (the Yogi) feels that Infinite Bliss which can be grasped by the (pure) intellect and which transcends the senses, and established wherein he never moves from the Reality.


English Translation of Sanskrit Commentary By Sri Shankaracharya's
6.21 Yatra, when, at the time when; vetti, one experiences; tat, that; atyantikam, absolute-which is verily limitless, i.e. infinite; sukham, Bliss; yat, which; buddhi-grahyam, can be intuited by the intellect, intuited by the intellect alone, without the help of the senses; and which is atindriyam, beyond the senses, i.e. not objective; (-when one experieneces this kind of Bliss) and sthitah, being established in the nature of the Self; ayam, this person, the illumined one; eva, surely; na calati, does not swerve; tattvatah, from that Reality-i.e. does not deviate from the nature of Reality-.
Further,


Transliteration Bhagavad Gita 6.21Sukhamaatyantikam yattad buddhi graahyamateendriyam;
Vetti yatra na chaivaayam sthitashchalati tattwatah.


Word Meanings Bhagavad Gita 6.21sukham—happiness; ātyantikam—limitless; yat—which; tat—that; buddhi—by intellect; grāhyam—grasp; atīndriyam—transcending the senses; vetti—knows; yatra—wherein; na—never; cha—and; eva—certainly; ayam—he; sthitaḥ—situated; chalati—deviates; tattvataḥ—from the Eternal Truth