Faithless means, anyone can understand, those who do not believe in the words of God. They are faithless. Just like a child. By nature, he has to believe his parents, his superiors, his teacher, but if he does not believe in the words of the superior, then where is the possibility of education? There is no possibility. This is the first qualification.
Lecture on Bhagavad-gita 9.3, Melbourne, April 21, 1976