Verse
बाह्यस्पर्शेष्वसक्तात्मा विन्दत्यात्मनि यत्सुखम् ।स ब्रह्मयोगयुक्तात्मा सुखमक्षयमश्नुते ॥
When the soul is no longer attached to the touches of outward things, then one finds the happiness that exists in the Self; such a one enjoys an imperishable happiness, because his self is in Yoga, yukta, by Yoga with the Brahman.
Gītā 5·21