The process of understanding Krsna is sevonmukha — by rendering service. Sevonmukhe hi jihvadau. Realization of Vasudeva is possible by rendering service, beginning with the tongue. The tongue has two functions — to vibrate and to taste. So if one repeatedly hears and vibrates the Hare Krsna mantra and tastes prasada, food offered to Krsna, by this very simple method one will realize Vasudeva, Krsna. Krsna will reveal Himself. It is not that by our endeavor alone we can understand Krsna, but our endeavor in loving service will make us qualified, and then Krsna will reveal Himself (svayam eva sphuraty ada?).

Srila Prabhupada – Teachings of Queen Kunti – ‘Approaching Krsna, the All Pervading Truth’, Ch 4