It is not possible to comprehend the greatness of Kṛṣṇa and His opulences. The senses of the individual soul are limited and do not permit him to understand the totality of Kṛṣṇa's affairs. Still the devotees try to understand Kṛṣṇa, but not on the principle that they will be able to understand Kṛṣṇa fully at any specific time or in any state of life. Rather, the very topics of Kṛṣṇa are so relishable that they appear to the devotees as nectar. Thus the devotees enjoy them.
(Bhagavad-Gita----10:19----purport).

One cannot understand anything spiritual from a materialistic scholar puffed up with academic knowledge. As stated in Bhagavad-gītā (18.55), bhaktyā mām abhijānāti: one must try to understand Kṛṣṇa by devotional service and from a devotee.
(Srimad Bhagavatam----7:4:44----purport).

Because of ignorance one is put into temporary bodies one after another. The spirit soul, however, does not need to enter such temporary bodies. He does so only due to his ignorance or his forgetfulness of Kṛṣṇa. Therefore in the human form of life, when one's intelligence is developed, one should change his consciousness by trying to understand Kṛṣṇa. Then one can be liberated.
(Srimad Bhagavatam----7:7:27----purport).

According to the Bhagavad-gītā, simply by understanding Kṛṣṇa one can get free from the cycle of birth and death. Tyaktvā dehaṁ punar janma naiti mām eti so ‘rjuna (B.G.4:9). Unfortunately this great science of Kṛṣṇa consciousness has been impeded by Māyāvādī philosophers, who are opposed to the personality of Kṛṣṇa. Those who are preaching this Kṛṣṇa consciousness movement must try to understand Kṛṣṇa from the statements given in the Bhakti-rasāmṛta-sindhu (The Nectar of Devotion).
(Sri Caitanya Caritamrta----2:23:82-83----purport).

As stated in Bhagavad-gītā (7.19), one attains real knowledge when he understands Kṛṣṇa and surrenders unto Him (bahūnāṁ janmanām ante jñānavān māṁ prapadyate). To become learned and free from material contamination, therefore, one should try to understand Kṛṣṇa, for thus one is immediately liberated from all pious and impious activities and their reactions.
(Srimad Bhagavatam----6:1:11----purport).

Those who are not brāhmaṇas but atheists do not know what is pravṛtti-mārga or nivṛtti-mārga; they simply want to obtain pleasure at any cost. Our Kṛṣṇa consciousness movement is therefore training devotees to give up the pravṛtti-mārga and accept the nivṛtti-mārga in order to return home, back to Godhead. This is a little difficult to understand, but it is very easy if one takes to Kṛṣṇa consciousness seriously and tries to understand Kṛṣṇa. A Kṛṣṇa conscious person can understand that performing yajña according to the karma-kāṇḍa system is a useless waste of time and that merely giving up the karma-kāṇḍa and accepting the process of speculation is also unfruitful.
(Srimad Bhagavatam----7:15:52----purport).