Bhagwad Gita
Chapter 3, Verse 17
यस्त्वात्मरतिरेव स्यादात्मतृप्तश्च मानवः।
आत्मन्येव च सन्तुष्टस्तस्य कार्यं न विद्यते।।3.17।।
One who is, however, taking pleasure in the self, who is illumined in the self, who rejoices in and is satisfied with the self only, fully satiated - for him there is no duty.