Bhagavad Gita 2.49
Physical action is far inferior to an intellect concentrated on the Divine. Therefore, have recourse to Pure Intelligence. It is only the small-minded who work for reward.
दूरेण ह्यवरं कर्म बुद्धियोगाद्धनञ्जय।
बुद्धौ शरणमन्विच्छ कृपणाः फलहेतवः॥dūreṇa hyavaraṃ karma buddhiyogāddhanañjaya|
buddhau śaraṇamanviccha kṛpaṇāḥ phalahetavaḥ||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).