Out of many millions of wandering living entities, one who is very fortunate gets an opportunity to associate with a bona fide spiritual master by the grace of Krsna.
If he waters the seed gradually by the process of sravana and kirtana the seed will begin to sprout.As one waters the bhakti lata bija, the seed sprouts, and the creeper gradually increases until it penetrates the walls of this universe and goes beyond the Viraja river between the spiritual world and the material world.
Out of many thousands of such experts in the performance of sacrifices, one who has surpassed all the knowledge in the Vedas is considered the best.
And out of many, many thousands of such worshipers of Visnu, one who is a pure Vaisnava or an exclusive devotee of Sri Krsna is the best because only he will attain the highest abode called Param-dhama, which is described in the Bhagavad-gita by Sri Krsna Himself.
(Garuda Purana) ..."Out of millions of great sages who are liberated souls, it is very difficult to find a sober devotee of Lord Narayana."