Jagadguru Shree Kripaluji Maharaj puts this very nicely: Bhakti is the essential ingredient in all paths leading to knowledge of God. devoid of bhakti cannot truly understand the import of the Bhagavad Gita, even though they themselves may think that they do.
Those who practice karm, jñāna, aṣhṭāṅg, etc.
However, once again, He deems it fit to bring in devotion, and says that only the bhaktas (devotees) can truly understand this knowledge. Shree Krishna now concludes His description of the field and the object of knowledge, by mentioning the fruit of knowing this topic.
