CC Madhya 25.270

ihāra prasāde pāibā kṛṣṇa-tattva-sāra
sarva-śāstra-siddhāntera ihāṅ pāibā pāra
Word for word: 
ihāra prasāde — by hearing these teachings of Śrī Caitanya Mahāprabhu; pāibā — you will get; kṛṣṇa-tattva-sāra — the essence of the truth of Kṛṣṇa; sarva-śāstra — of all revealed scriptures; siddhāntera — of conclusions; ihāṅ — here; pāibā — you will get; pāra — the ultimate limit.
Translation: 
By understanding the pastimes of Śrī Caitanya Mahāprabhu, one can understand the truth about Kṛṣṇa. By understanding Kṛṣṇa, one can understand the limit of all knowledge described in various revealed scriptures.
Purport: 

As Lord Kṛṣṇa states in the Bhagavad-gītā (7.3):

manuṣyāṇāṁ sahasreṣukaścid yatati siddhaye
yatatām api siddhānāṁ
kaścin māṁ vetti tattvataḥ

“Out of many thousands among men, one may endeavor for perfection, and of those who have achieved perfection, hardly one knows Me in truth.”

It is very difficult to understand Kṛṣṇa, but if one tries to understand Śrīmad-Bhāgavatam through Caitanya Mahāprabhu’s bhakti cult, one will undoubtedly understand Kṛṣṇa very easily. If somehow or other one understands Kṛṣṇa, his life is successful. Again, as Kṛṣṇa states in the Bhagavad-gītā (4.9):

janma karma ca me divyamevaṁ yo vetti tattvataḥ
tyaktvā dehaṁ punar janma
naiti mām eti so ’rjuna

“One who knows the transcendental nature of My appearance and activities does not, upon leaving the body, take his birth again in this material world, but attains My eternal abode, O Arjuna.”