Bhagavad Gita, Chapter 18, Verse 64

Hear again My supreme word, the profoundest of all; because you are dearly beloved of Me, therefore will I speak what is good to you.

Krishna names the real reason for sharing this final teaching directly, personal affection, not obligation.

This isn't framed as one more required lesson, it's tied explicitly to real, felt closeness between teacher and listener. That stated motive gives extra weight to what follows.