You shall be always feeling jolly. If I am not jolly, if I am not prasanna-manasa, that means maya [illusion] has attacked me. A bhagavad-bhakta [devotee of the Lord] shall never be aprasanna, not joyful. Always joyful. If he is actually in contact with Krishna, how he can become morose? No. If he is morose, if he is unhappy, that means maya has attacked him. This is the test." —Srila Prabhupada, in a lecture on Srimad-Bhagavatam 1.2.20, given on October 31, 1972, in Vrindavana.