"So this is the simple process. Anta-kāle ca mām eva smaran muktvā kalevaram, yaḥ prayāti sa mad-bhāvaṁ (BG 8.5). ('And whoever, at the time of death, quits his body, remembering Me alone, at once attains My nature. Of this there is no doubt.') Āti, 'he goes'; na asti atra saṁśayaḥ, 'you do not doubt it.'
If you have taken Kṛṣṇa as the supreme authority, and Kṛṣṇa says there is no doubt about it, then why shall I become doubtful? Why shall I disbelieve Kṛṣṇa? This is the process. Chant Hare Kṛṣṇa. Always remember Kṛṣṇa. And death may take place at any time. There is no guarantee that after so much time you'll die. At any moment, you can die. Death, there is no guarantee. But it is a guarantee that you must die. That is guaranteed. But when you will die, that is not guaranteed. Therefore we must be prepared for death at any moment. Therefore a devotee is not afraid of death. He knows that death may come at any moment. We are... Nowadays, it has..., the death is very cheap. Because we are using this motorcar, these aeroplanes, so many things, ships and other things for transportation, and there is, every moment there is danger of accident, collapse, everything. So death is now very cheap. So we must be prepared for death at any moment. There is no guarantee, that 'I am not yet old enough. I am not yet eighty years, ninety years. Why shall I die?' No. You may be twenty years, twenty-five years or younger than that. Death is assured, and it can take place at any moment.
Therefore our only duty is to think of Kṛṣṇa, Puruṣottama, so that we may die at any moment, but we become spiritual salvation. This is our only duty. We have no other duty. How to remember Kṛṣṇa twenty-four hours, that is the greatest process of yoga perfection. Yoginām api sarveṣāṁ mad-gatenāntar-ātmanā. Mad-gatenāntar-ātmanā (BG 6.47): 'Always thinking of Me, he is first-class yogī.' So this Hare Kṛṣṇa mahā-mantra is so nice that as soon as you chant Hare Kṛṣṇa, you immediately remember Kṛṣṇa. You go on chanting; that means remembering. So in chanting, chanting, if there is death, so I am remembering Kṛṣṇa. What is my fear? I am going to Kṛṣṇa, back to home, back to Godhead. It is so nice.
So always be engaged in Kṛṣṇa consciousness, chant Hare Kṛṣṇa mantra. Then you are sure and safe, not only in this life, but also you are going back to home, back to Godhead. It is so nice thing."
(Srila Prabhupada Lecture, Geneva, June 7, 1974)