A living entity is happily the part and parcel of the Lord, and thus his natural function is to render immediate service to the Lord. By the spell of illusion one tries to be happy by serving his personal sense gratification in different forms which will never make him happy. Instead of satisfying his own personal material senses, he has to satisfy the senses of the Lord. That is the highest perfection of life. The Lord wants this, and He demands it. One has to understand this central point of Bhagavad-gita. Our Krsna consciousness movement is teaching the whole world this central point, and because we are not polluting the theme of Bhagavad-gita As It Is, anyone seriously interested in deriving benefit by studying the Bhagavad-gita must take help from the Krsna consciousness movement for practical understanding of Bhagavad-gita under the direct guidance of the Lord.

Srila Prabhupada; Bg preface