Sanskrit

कर्मण्यकर्म यः पश्येदकर्मणि च कर्म यः। स बुद्धिमान् मनुष्येषु स युक्तः कृत्स्नकर्मकृत्।।4.18।।

Summary

He who can see inaction in action, and action in inaction, is the wisest among men. He is a saint, even though he still acts.