“In the Brahma-vaivarta Purana, Vishnu tells Shiva that in the age of Kali, men full of anxieties of various kinds can vainly labor in fruitive activity and philosophical speculations, but when they are engaged in devotional service, the result is sure and certain, and there is no loss of energy.” (Shrila Prabhupada, Shrimad Bhagavatam, 1.18.12 Purport)
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