This is necessary for you to become this Kṛṣṇa conscious, to adopt this life of Kṛṣṇa consciousness. Why? Because jarā-maraṇa-mokṣāya: "In order to get out of the miseries of jarā." Jarā means old age, invalidity. And jarā-maraṇa. Maraṇa 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. But this ignorance has to be removed if one has to become out of these clutches of birth, death, old age and disease. This is not possible to remove by the so-called material science. Material science cannot remove these miseries. They can remove temporary, something artificially, some of our miseries. Just like we are feeling little warm. If the room was, had been air conditioned, we could feel some comfort. That is temporary. But our ultimate miseries are these four things: jarā-maraṇa-mokṣa. Jarā means old age and birth, death.