Bhagavad Gita 2.47
कर्मण्येवाधिकारस्ते मा फलेषु कदाचन। मा कर्मफलहेतुर्भूर्मा ते सङ्गोऽस्त्वकर्मणि॥
Easy meaning
You control the effort, not the outcome. Don’t freeze because results are slow — and don’t quit the work.
When to use
When you only measure yourself by likes, ranks, or salary jumps.