So if one understands these things or tries to understand, even he does not understand, tries to understand, then he becomes liberated from this process of birth and death. Kṛṣṇa says. So become very serious to understand Kṛṣṇa and remain in Kṛṣṇa consciousness. Then this problem, birth, death, old age and disease will be solved, automatically, very easily. There will be no problem.
That is the function of the human life, to understand that "I am eternal." Kṛṣṇa says that "In the past we existed, in the present we are existing, and in the future we shall continue to exist." Then why I have got this type of body by which I am actually, not actually, superficially I am not existing. So this is the problem. A dhīra means a sober man will think of this problem, that "I want to live. Why death takes place? I want to live very healthy life. Why disease comes? I don't want to become old man. Why old age comes?"