Bhagavad Gita, Chapter 18, Verse 1

Arjuna said: I desire to know severally, O mighty-armed, the truth of Sannyâsa, O Hrishikesha, as also of Tyâga, O slayer of Keshi.

A real, precise question opens the final chapter, two similar-sounding words that actually mean different things.

Arjun doesn't let sanyās and tyāg blur together, he asks Krishna to name the real distinction between them. That precision sets the tone for this whole closing chapter.