यस्त्वात्मरतिरेव स्यादात्मतृप्तश्च मानवः। आत्मन्येव च सन्तुष्टस्तस्य कार्यं न विद्यते ॥

yas tvātma-ratir eva syād ātma-tṛiptaśh cha mānavaḥ ātmanyeva cha santuṣhṭas tasya kāryaṁ na vidyate

But the man who rejoiceth in the Self, with the Self is satisfied, and is content in the Self, for him verily there is nothing to do;

In plain words: Krishna says a person who finds full joy and contentment in the Self, the true inner spirit, has no duty left to do.