Thus, O sinless one, this most secret teaching has been spoken by me. By understanding it, O descendant of Bharata, a person becomes wise and has done all that was to be done.
Explanation
Krishna closes the fifteenth chapter, addressing Arjuna as "sinless" (anagha) and "descendant of Bharata" (Bhārata). He calls the teaching on the Supreme Person (Purushottama) the most secret instruction (śāstra), and says that understanding it makes a person truly wise (buddhimān) and fulfilled (kṛta-kṛtya), with nothing left to accomplish. Traditions differ on whether "this śāstra" means just this chapter or the whole Gita, and on whether the fulfilment is liberation through knowledge or through devotion.