BG Chap 9 - Conclusion
The last verse of the ninth chapter (9.34), which is exactly in the middle of the Gītā, and which will be repeated practically verbatim at the end of the Gītā, is the most confidential and essential śloka. It is the essence of the essence of the essence and the most confidential of all knowledge: Become a pure devotee of Lord Kṛṣṇa.
The chapter began with Kṛṣṇa saying that He would impart the most confidential knowledge. He concluded the chapter with the instruction that one become His devotee. In BG 18.64, He again says that He would impart the most confidential and supreme instruction, and in 18.65, He repeats what He said here in BG 9.34 almost verbatim. Thus there should be no doubt that the confidential of all instructions is to be attached to Kṛṣṇa in pure love.
In this chapter, bhakti, like Gaṅga, not considering who is suitable or unsuitable, and destroying all sins by its very touch, is alone considered to be the king of all secrets.
Thus ends Chapter 9 of Bhagavad gita culled from 'Bhagavad gita As it is' by Srila Prabhupada, 'As they surrender' by Bhurijana Prabhu, 'Sarartha Varsini' by Visvanatha Cakravarti Thakura and 'Gita Bhusana' by Baladeva Vidyabhusana.