Śrīmad-Bhāgavatam · Text 7.6.4
Who is speaking and story frame
तत्प्रयासो न कर्तव्यो यत आयुर्व्यय: परम् ।
न तथा विन्दते क्षेमं मुकुन्दचरणाम्बुजम् ॥ ४ ॥
tat-prayāso na kartavyo
yata āyur-vyayaḥ param
na tathā vindate kṣemaṁ
mukunda-caraṇāmbujam
Endeavors merely for sense gratification or material happiness through economic development are not to be performed, for they result only in a loss of time and energy, with no actual profit. If one’s endeavors are directed toward Kṛṣṇa consciousness, one can surely attain the spiritual platform of self-realization. There is no such benefit from engaging oneself in economic development.
Read Śrīla Prabhupāda's purport on Vedabase.io