It is clearly said here [BG 18.67] that one should follow Sri Krishna alone. If any body makes his choice not to follow him surely he will have relative result. Bhagavad-gita is mostly read by almost all classes of people of the world but unfortunately they are accepted in an independent choice of indirect interpretation. That is a deviation and for that reason only they cannot derive the direct benefit.
Letter to Mr. Bailey, October 2, 1951