"Bhagavad Gita Chapter 2, Verse 47"
कर्मण्येवाधिकारस्ते मा फलेषु कदाचन।
मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि॥
You have the right to perform your actions, but not to the fruits thereof.
Do not let the fruits of action be your motive, nor let your attachment be to inaction.