A Devotee hears transcendental knowledge with complete willingness to surrender to that knowledge.
Disciplic succession is the means by which transcendental knowledge is preserved.
Transcendental knowledge is not conveyed or carried by words but by consciousness.
Only one who has properly grasped the transcendental knowledge from the right source by submissive hearing can properly explain the subject.
Sravanam, or hearing, is the first step in acquiring transcendental knowledge. One should not give aural reception to unauthorized persons, but should approach the proper person, as recommended in Bhagavad Gita.