"Nitya means eternal. Ananda means pleasure. Material pleasure is not eternal. That is the distinction. Therefore those who are intelligent, they are not interested with this flickering pleasure of material world. Every one of us, as living entity, we are searching after pleasure. But the pleasure which we are seeking, that is flickering, temporary. That is not pleasure. Real pleasure is nityananda, eternal pleasure. So anyone who has no contact with Nityananda, it is to be understood that his life is spoiled."
(Srila Prabhupada lecture, January 31, 1969)
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