Source: BG 2.12 Purport

Those who are envious of Kṛṣṇa as the Supreme Personality of Godhead have no bona fide access to the great literature. The non-devotee’s approach to the teachings of the Gītā is something like that of a bee licking on a bottle of honey. One cannot have a taste of honey unless one opens the bottle. Similarly, the mysticism of the Bhagavad-gītā can be understood only by devotees, and no one else can taste it, as it is stated in the Fourth Chapter of the