In the 67th verse of this chapter, the Lord explicitly forbade the Gita's being spoken to those who are envious of the Lord. In other words, Bhagavad-gita is for the devotees only, but it so happens that sometimes a devotee of the Lord will hold open class, and in that class all the students are not expected to be devotees. Why do such persons hold open class? It is explained here that although everyone is not a devotee, still there are many men who are not envious of Krsna. They have faith in Him as the Supreme Personality of Godhead. If such persons hear from a bona fide devotee about the Lord, the result is that they become at once free from all sinful reactions and after that attain to the planetary system where all righteous persons are situated. Therefore simply by hearing Bhagavad-gita, even a person who does not try to be a pure devotee attains the result of righteous activities. Thus a pure devotee of the Lord gives everyone a chance to become free from all sinful reactions and to become a devotee of the Lord.