So Śukadeva Gosvāmī has recommended to Parīkṣit Mahārāj that in order to be fearless of death one has to hear and chant and remember the Supreme Personality of Godhead, Kṛṣṇa, by all means. He also mentions that the Supreme Personality of Godhead is sarvātmā. Sarvātmā means "the supersoul of everyone." Kṛṣṇa is also mentioned as īśvara, the supreme controller who is situated in everyone's heart. Therefore, if some way or other we become attached to Kṛṣṇa, He will make us free from all danger. In the Bhagavad-gītā it is said that anyone who becomes a devotee of the Lord is never vanquished. Others, however, are always vanquished. Vanquished means that after getting this human form of life, a person does not come out of the entanglement of birth and death and thus misses his golden opportunity. Such a person does not know where he is being thrown by the laws of nature.
Suppose one does not develop Kṛṣṇa consciousness in this human form of life. He will be thrown into the cycle of birth and death involving 8,400,000 species of life, and his spiritual identity will remain lost. One does not know whether he is going to be a plant, or a beast, or a bird, or something like that, because there are so many species of life. The recommendation of Rūpa Gosvāmī for reviving our original Kṛṣṇa consciousness is that somehow or other we should apply our minds to Kṛṣṇa very seriously and thus also become fearless of death. After death we do not know our destination, because we are completely under the control of the laws of nature. Only Kṛṣṇa, the Supreme Personality of Godhead, is controller over the laws of nature. Therefore, if we take shelter of Kṛṣṇa seriously, there will be no fear of being thrown back into the cycle of so many species of life. A sincere devotee will surely be transferred to the abode of Kṛṣṇa, as affirmed in the Bhagavad-gītā.
In the Padma Purāṇa also the same process is advised. There it is said that one should always remember Lord Viṣṇu. This is called dhyāna, or meditation—always remembering Kṛṣṇa. It is said that one has to meditate with his mind fixed upon Viṣṇu. Padma Purāṇa recommends that one always fix his mind on the form of Viṣṇu by meditation and not forget Him at any moment. And this state of consciousness is called samādhi, or trance.
We should always try to mold the activities of our lives in such a way that we will constantly remember Viṣṇu, or Kṛṣṇa. That is Kṛṣṇa consciousness. Whether one concentrates his mind on the four-handed form of Viṣṇu or on the form of two-handed Kṛṣṇa, it is the same. The Padma Purāṇa recommends: somehow or other, always think of Viṣṇu without forgetting Him under any circumstances. Actually, this is the most basic of all regulative principles. For, when there is an order from a superior about doing something, there is simultaneously a prohibition. When the order is that one should always remember Kṛṣṇa, the prohibition is that one should never forget Him. Within this simple order and prohibition all regulative principles are found complete.
This regulative principle is applicable to all varṇas and āśramas, the castes and occupations of life. There are four varṇas, namely, the brāhmaṇas (priests and intellectuals), the kṣatriyas (warriors and statesmen), the vaiśyas (businessmen and farmers) and the śūdras (laborers and servants). There are also four standard āśramas, namely brahmacarya (student life), gṛhastha (householder), vānaprastha (retired) and sannyāsa (renounced). The regulative principles are not only for the brahmacārīs (celibate students) to follow, but are applicable for all. It doesn't matter whether one is a beginner—a brahmacārī—or if one is very advanced—a sannyāsī. The principle of remembering the Supreme Personality of Godhead constantly and not forgetting Him at any moment is meant to be followed by everyone without fail.