This is necessary for you to become this Kеслa conscious, to adopt this life of Krsna consciousness. Why? Because jarд-maraлa-mokсдya: "In order to get out of the miseries of jarд." Jarд means old age, invalidity. And jarд-maraлa. Maraлa means death. Due to ignorance, we forget the miseries of death, the miseries of invalidity, or old age. We think, "Now we are young, young man, young woman. Oh, we don't care for what is old age or what is death. Let us enjoy." We forget. But a man who is not in ignorance, he has always in his view that this material life is full of miseries because there is birth, there is death, there is old age and there is disease. So we materialists, we don't take into consideration that birth, death, disease and old age are the greatest miseries of our life due to our ignorance.
Lecture on Bhagavad-gita 7.28-8.6, New York, October 23, 1966