One verse from the Bhagavad Gita, every morning.

कर्मण्येवाधिकारस्ते मा फलेषु कदाचन। मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि।।
“Your right is only to work, but not to its results; do not let the results of action be your motive, nor let your attachment be to inaction.”
Bhagavad Gita 2.47
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