BG 18.67-69
Never is this to be spoken by thee to anyone who is without asceticism, nor without devotion, nor to one who desireth not to listen, nor yet to him who speaketh evil of Me. He who shall declare this supreme secret among My devotees, having shown the highest devotion for Me, without doubt he shall come to Me. Nor is there any among men who performeth dearer service to Me than he, nor any other shall be more beloved by Me on earth than he.