Bhagavad Gita 3.17
On the other hand, the soul who meditates on the Self is content to serve the Self and rests satisfied in the Self; there is nothing more for them to accomplish.
यस्त्वात्मरतिरेव स्यादात्मतृप्तश्च मानवः।
आत्मन्येव च सन्तुष्टस्तस्य कार्यं न विद्यते॥yastvātmaratireva syādātmatṛptaśca mānavaḥ|
ātmanyeva ca santuṣṭastasya kāryaṃ na vidyate||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).