The material color of the mind is changed when one washes it from contaminations of life-breathing and thereby frees it from the contamination of repeated births and deaths and situates it in pure spiritual life. All is manifested by the temporary embodiment of the material body, which is a production of the mind at the time of death, and if the mind is purified by practice of transcendental loving service to the Lord and is constantly engaged in the service of the lotus feet of the Lord, there is no more chance of the mind's producing another material body after death. It will be freed from absorption in material contamination. The pure soul will be able to return home, back to Godhead.
(Srimad Bhagavatam--1:15:41---purport).

Death is inevitable for everyone, intelligent or foolish. But Parīkṣit Mahārāja has been addressed by the Gosvāmī as the manīṣī, or the man of highly developed mind, because at the time of death he left all material enjoyment and completely surrendered unto the lotus feet of the Lord by hearing His messages from the right person, Śukadeva Gosvāmī. But aspirations for material enjoyment by endeavoring persons are condemned. Such aspirations are something like the intoxication of the degraded human society. Intelligent persons should try to avoid these aspirations and seek instead the permanent life by returning home, back to Godhead.
(Srimad Bhagavatam---2:3:2-7---purport).

In Bhagavad-gītā it is said that at the time of death one will be absorbed in the thoughts which he cultivated during his lifetime. A person who had no other idea than to properly maintain his family members must have family affairs in his last thoughts. That is the natural sequence for a common man. The common man does not know the destiny of his life; he is simply busy in his flash of life, maintaining his family. At the last stage, no one is satisfied with how he has improved the family economic condition; everyone thinks that he could not provide sufficiently. Because of his deep family affection, he forgets his main duty of controlling the senses and improving his spiritual consciousness. Sometimes a dying man entrusts the family affairs to either his son or some relative, saying, "I am going. Please look after the family." He does not know where he is going, but even at the time of death he is anxious about how his family will be maintained.
(Srimad Bhagavatam---3:30:18---purport).

Consciousness is carried with the transmigration of the soul. There are many instances of this in Vedic history, such as the case of Mahārāja Bharata. After quitting his body as a king, Mahārāja Bharata was transferred to the body of a deer, but he retained the same consciousness. He knew that although formerly he was King Bharata, he had been transferred to the body of a deer because of his absorption in thinking of a deer at the time of his death. In spite of his having the body of a deer, however, his consciousness was as good as it was in the body of King Bharata. The arrangement by the Lord is so nice that if a person's consciousness is turned into Kṛṣṇa consciousness, there is no doubt that in his next life he will be a great devotee of Kṛṣṇa, even if he is offered a different type of body.
(Srimad Bhagavatam---4:7:9---purport).

When the body is attacked by the viṣṇu-jvāra, the fiery condition becomes so acute that sometimes one remains in a coma. This means that the body is in such severe pain that one becomes unconscious and cannot feel the miseries taking place within the body. Indeed, the living entity becomes so helpless at the time of death that, although unwilling, he is forced to give up the body and enter another. In Bhagavad-gītā it is stated that man may, by scientific advancement, improve the temporary living conditions, but that he cannot avoid the pangs of birth, old age, disease and death.
(Srimad Bhagavatam---4:28:12---purport).

The swan takes great pleasure in diving within water and being encircled by the stem of the lotus flower. This entanglement is sporting joy. If, in our healthy condition, we think of the lotus feet of the Lord and die, it is most fortunate. In old age, at the time of death, the throat sometimes becomes choked with mucus or blocked by air. At such a time the sound vibration of Hare Kṛṣṇa, the mahā-mantra, may not come out. Thus one may forget Kṛṣṇa. Of course, those who are strong in Kṛṣṇa consciousness cannot possibly forget Kṛṣṇa at any stage because they are accustomed to chanting the Hare Kṛṣṇa mantra, especially when there is a signal from death.
(Srimad Bhagavatam---4:28:15---purport).

It is not infrequent for a person overly attached to the material body to request a physician to prolong his life at least for some time. If the so-called scientific physician is able to prolong one's life for a few minutes through the use of oxygen or other medicines, he thinks that he is very successful in his attempts, although ultimately the patient will die. This is called the struggle for existence. At the time of death both patient and physician still think of prolonging life, although all the constituents of the body are practically dead and gone.
(Srimad Bhagavatam---4:28:16---purport).

Whatever state of being one remembers when he quits his body, that state he will attain without fail." The atmosphere of the subtle body at the time of death is created by the activities of the gross body. Thus the gross body acts during one's lifetime, and the subtle body acts at the time of death. The subtle body, which is called liṅga, the body of desire, is the background for the development of a particular type of gross body, which is either like that of one's mother or like that of one's father. According to the Ṛg Veda, if at the time of sex the secretions of the mother are more profuse than those of the father, the child will receive a female body, and if the secretions of the father are more profuse than those of the mother, the child will receive a male body.
(Srimad Bhagavatam---6:1:54---purport).

To prove the strength of devotional service, Śukadeva Gosvāmī described the history of Ajāmila. Ajāmila was a resident of Kānyakubja (the modern Kanauj). He was trained by his parents to become a perfect brāhmaṇa by studying the Vedas and following the regulative principles, but because of his past, this youthful brāhmaṇa was somehow attracted by a prostitute, and because of her association he became most fallen and abandoned all regulative principles. Ajāmila begot in the womb of the prostitute ten sons, the last of whom was called Nārāyaṇa. At the time of Ajāmila's death, when the order carriers of Yamarāja came to take him, he loudly called the name Nārāyaṇa in fear because he was attached to his youngest son. Thus he remembered the original Nārāyaṇa, Lord Viṣṇu. Although he did not chant the holy name of Nārāyaṇa completely offenselessly, it acted nevertheless.
(Srimad Bhagavatam---6:1--summary).