न मे पार्थास्ति कर्तव्यं त्रिषु लोकेषु किञ्चन। नानवाप्तमवाप्तव्यं वर्त एव च कर्मणि ॥

na me pārthāsti kartavyaṁ triṣhu lokeṣhu kiñchana nānavāptam avāptavyaṁ varta eva cha karmaṇi

There is nothing in the three worlds, O Pârtha, that should be done by Me, nor anything unattained that might be attained; yet I mingle in action.

In plain words: Krishna tells Arjuna (here called Pārtha, son of Pritha) that there is nothing in all the worlds he needs to do and nothing he still needs to gain. Even so, he keeps on working.