कर्मण्येवाधिकारस्ते मा फलेषु कदाचन। मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि॥
karmaṇy-evādhikāras te mā phaleṣu kadācana; mā karma-phala-hetur bhūr mā te saṅgo 'stv akarmaṇi
You have a right to your actions alone, never to their fruits. Do not let the fruits of action be your motive, nor let attachment draw you to inaction.
“Give your best to the effort and release the outcome.”
Source: Bhagavad Gita 2.47