“In this material world there is a great illusion which covers real intelligence. A man in the mode of passion wants to work very hard to derive some benefit, but he does not know that time will never allow him to enjoy anything permanently. Compared with the work one expends, the gain is not so profitable. Even if it is profitable, it is not without its distresses.” (Shrila Prabhupada, Shrimad Bhagavatam, 4.25.4 Purport)