श्लोक 2.47

कर्मण्येवाधिकारस्ते मा फलेषु कदाचन। मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि॥

karmaṇy-evādhikāras te mā phaleṣu kadācana, mā karma-phala-hetur bhūr mā te saṅgo 'stv akarmaṇi.

Meaning

Your job is to do your best. Do not worry too much about winning or losing. Doing your duty sincerely is what truly matters.