Maharaja Kulasekhara king, a great devotee, is praying to Krsna, "Krsna, this is the opportune time. Now I am healthy. I am quite in good health so let me die immediately, thinking of You, because my whole purpose is to think of You, of Your pastimes, at the time of death. So generally, at the time of death, kapha-vata-pittaih, the whole system becomes disarranged. There are coughing, there are headache, there is some pain, this is general system. Sometimes they are so intolerable that the man who is going to die, he cries.
The system within the body is so complicated that at any time it can be disarranged, and it becomes a great source of pain. So, at the time of death means, the arrangement becomes so dangerously painful, that one leaves this body, "No more." This is death. This bodily arrangement becomes so painful. Just like one commits suicide. When the situation is too much painful he wants a rescue by committing suicide. Similarly, when the bodily pains are too severe, then the living entity can not live in this body. Tyaktva deham, he gives up this body. So we have to give up this body, that we forget.
New York, October 23, 1973