Nobody can see Krishna, who is both omniscient and omnipotent, with mundane vision. Our eyes must first be opened with the torchlight of knowledge. Wherever bona fide knowledge is cultivated, the darkness of nescience is banished. It is not difficult for the Supreme Lord to arrange for someone who loves Him to see Him, and also to take His association.
Reference: Reflections on Sacred Teachings, Volume Four: Sri Isopanisad, Mantra 3