manuṣyāṇāṁ sahasreṣu kaścid yatati siddhaye yatatām api siddhānāṁ kaścin māṁ vetti tattvataḥ

manusyanam sahasresu
kascid yatati siddhaye
yatatam api siddhanam
kascin mam vetti tattvatah
"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 Krsna, but if one tries to understand Srimad-Bhagavatam through Caitanya Mahaprabhu's bhakti cult, one will undoubtedly understand Krsna very easily. If somehow or other one understands Krsna, his life will be successful. Again, as stated in Bhagavad-gita (4.9):
 

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