UtshovBhagavad Gita 4.18
कर्मण्यकर्म यः पश्येदकर्मणि च कर्म यः।
स बुद्धिमान् मनुष्येषु स युक्तः कृत्स्नकर्मकृत्।।4.18।।
Karmanyakarma yah pashyedakarmani cha karma yah
Sa buddhiman manushyeshu sa yuktah kritsnakarmakrit
Simple meaning, written by AIHe who sees action in inaction and inaction in action is the wise among men and is united with all actions.