Bhagavad Gita: Verse 5.21
बाह्यस्पर्शेष्वसक्तात्मा विन्दत्यात्मनि यत्सुखम् ।
स ब्रह्मयोगयुक्तात्मा सुखमक्षयमश्नुते ॥ ५-२१॥
bāhyasparśeṣvasaktātmā vindatyātmani yatsukham
sa brahmayogayuktātmā sukhamakṣayamaśnute
With the self unattached to external contacts, he finds happiness in the Self; with the self engaged in the meditation of BRAHMAN, he attains endless happiness.
bāhyasparśeṣu = in external sense pleasure; asaktātmā = one who is not attached; vindati = enjoys; ātmani = in the self; yat = that which; sukhaṃ = happiness; saḥ = he; brahmayoga = by concentration in Brahman; yuktātmā = self-connected; sukhaṃ = happiness; akṣayaṃ = unlimited; aśnute = enjoys.;