There are many forefathers of the population of the universe, and all of them are born of the Supreme Lord, Kṛṣṇa. The Supreme Personality of Godhead, Kṛṣṇa, is the original forefather of all forefathers.
These are some of the opulences of the Supreme Lord. When one is firmly convinced of them, he accepts Kṛṣṇa with great faith and without any doubt, and he engages in devotional service. All this particular knowledge is required in order to increase one's interest in the loving devotional service of the Lord. One should not neglect to understand fully how great Kṛṣṇa is, for by knowing the greatness of Kṛṣṇa one will be able to be fixed in sincere devotional service.
(Bhagavad -Gita------10:7------purport).

Generally it is advised that Bhagavad-gītā be discussed amongst the devotees only, for those who are not devotees will understand neither Kṛṣṇa nor Bhagavad-gītā. Those who do not accept Kṛṣṇa as He is and Bhagavad-gītā as it is should not try to explain Bhagavad-gītā whimsically and become offenders. Bhagavad-gītā should be explained to persons who are ready to accept Kṛṣṇa as the Supreme Personality of Godhead. It is a subject matter for the devotees only and not for philosophical speculators. Anyone, however, who tries sincerely to present Bhagavad-gītā as it is will advance in devotional activities and reach the pure devotional state of life. As a result of such pure devotion, he is sure to go back home, back to Godhead.
(Bhagavad - Gita------18:68------purport).

We shall eternally enjoy the relationship with the Supreme Lord in different aspects. A special feature of this verse is the acceptance of the Supreme Lord as the supreme preceptor. Bhagavad-gītā was spoken directly by the Supreme Lord, and Arjuna accepted Kṛṣṇa as guru, or spiritual master. Similarly, we should accept only Kṛṣṇa as the supreme spiritual master.
Kṛṣṇa, of course, means Kṛṣṇa and His confidential devotees; Kṛṣṇa is not alone. When we speak of Kṛṣṇa, "Kṛṣṇa" means Kṛṣṇa in His name, in His form, in His qualities, in His abode and in His associates. Kṛṣṇa is never alone, for the devotees of Kṛṣṇa are not impersonalists. For example, a king is always associated with his secretary, his commander, his servant and so much paraphernalia. As soon as we accept Kṛṣṇa and His associates as our preceptors, no ill effects can destroy our knowledge. In the material world the knowledge which we acquire may change because of the influence of time, but nevertheless the conclusions received from Bhagavad-gītā, directly from the speeches of the Supreme Lord, Kṛṣṇa, can never change. There is no use interpreting Bhagavad-gītā; it is eternal.
(Srimad Bhagavatam------3:25:38------purport).

The forgetful living entity can be compared to a man who is under the influence of disease and has become mad or to a man haunted by ghosts, who acts without control and yet thinks himself to be in control. Under the influence of material nature, the conditioned soul becomes absorbed in material consciousness. In this consciousness, whatever is done under the influence of the material energy is accepted by the conditioned soul as self-actuated. Actually, the soul in his pure state of existence should be in Kṛṣṇa consciousness. When a person is not acting in Kṛṣṇa consciousness, he is understood to be acting in material consciousness. Consciousness cannot be killed, for the symptom of the living entity is consciousness. The material consciousness simply has to be purified. One becomes liberated by accepting Kṛṣṇa, or the Supreme Lord, as master and by changing the mode of consciousness from material consciousness to Kṛṣṇa consciousness.
(Srimad Bhagavatam------3:26:6------purport).

Similarly, one who understands the pure parental love of Nanda and Yaśodā for Kṛṣṇa will be saved from being dragged into material parental affection. If oneaccepts Kṛṣṇa as the supreme friend, the attraction of material friendship will be finished for him, and he will not be dismayed by so-called friendship with mundane wranglers. If he is attracted by servitorship to Kṛṣṇa, he will no longer have to serve the material body in the degraded status of material existence, with the false hope of becoming master in the future. Similarly, one who sees the greatness of Kṛṣṇa in neutrality will certainly never again seek the so-called relief of impersonalist or voidist philosophy. If one is not attracted by the transcendental nature of Kṛṣṇa, one is sure to be attracted to material enjoyment, thus to become implicated in the clinging network of virtuous and sinful activities and to continue material existence by transmigrating from one material body to another. Only in Kṛṣṇa consciousness can one achieve the highest perfection of life.
(Sri Caitanya Caritamrta------1:4:35------purport).

A devotee wants to remain always in the Lord's service. In this way, Kṛṣṇa is merciful to His devotee and gives him all protection from the dangers found on the path of devotional service. (4) The devotee should accept Kṛṣṇa as his supreme maintainer and master. He should not think that he is being protected by a demigod. He should depend only on Kṛṣṇa, considering Him the only protector. The devotee must be firmly convinced that within the three worlds he has no protector or maintainer other than Kṛṣṇa. (5) Self-surrender means remembering that one's activities and desires are not independent. The devotee is completely dependent on Kṛṣṇa, and he acts and thinks as Kṛṣṇa desires. (6) The devotee is meek and humble.
(Sri Caitanya Caritamrta------2:22:100------purport).