Srimad Bhagavadgita Sadhaka Sanjivani -Swami Ramsukhdas
This most profound secret, should not be unfolded to one, who is not austere, because he will not believe it, and he will find fault with it and thus have a downfall. Secondly, a man whose aim is not to purify his propensities, conduct etc., may think that he need not grieve, because the Lord will liberate him, from all sins. By thinking so, he may be indulging in evil and may have a fall. So, the Lord directs Arjuna, not to impart this secret gospel to one, who is devoid of austerities, otherwise, he may misuse it.