Bhagavad Gita, Chapter 18, Verse 29

Hear the triple distinction of intellect and fortitude, according to the Gunas, as I declare them exhaustively and severally, O Dhananjaya.

Krishna signals here that two more real categories, intellect and determination, are about to get the same three-part treatment.

This verse functions as a real transition, moving from action and its performers into the internal faculties driving them. The same structural approach continues without needing to be re-explained.