Śrīmad-Bhāgavatam 11.5.17

"The killers of the soul are never peaceful, because they consider that human intelligence is ultimately meant for expanding material life. Thus neglecting their real, spiritual duties, they are always in distress. They are filled with great hopes and dreams, but unfortunately these are always destroyed by the inevitable march of time."

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https://vedy.online/en/sb11/5/17