BG Chap 18 - Result of teaching this knowledge to the qualified

For one who explains this supreme secret to the devotees, pure devotional service is guaranteed, and finally he attains Kṛṣṇa. Those who do not accept Kṛṣṇa as He is and Bhagavad-Gītā as it is should not try to explain Bhagavad-Gītā whimsically and become offenders. Bhagavad-Gītā should be explained to persons who are ready to accept Kṛṣṇa as the Supreme Personality of Godhead. It is a subject matter for the devotees only and not for philosophical speculators. Anyone, however, who tries sincerely to present Bhagavad-Gītā as it is will advance in devotional activities and reach the pure devotional state of life. As a result of such pure devotion, he is sure to go back home, back to Godhead. There is none who satisfies Kṛṣṇa as much as the teacher of bhakti, nor will there be such a person in the future.