Bhagwad Gita
Chapter 6, Verse 21
सुखमात्यन्तिकं यत्तद्बुद्धिग्राह्यमतीन्द्रियम्।
वेत्ति यत्र न चैवायं स्थितश्चलति तत्त्वतः।।6.21।।
When a yogi experiences an infinite happiness that goes beyond ordinary senses and can only be understood by the mind, they become settled in that happiness and do not waver from true reality.