Bhagavad Gita, Chapter 4, Verse 9

He who thus knows, in true light, My divine birth and action, leaving the body, is not born again: he attains to Me, O Arjuna.

Really understanding what this all means, not just knowing the facts, is what actually changes something.

This isn't about memorizing details of a story, it's about genuinely grasping what's behind them. That real understanding is described as having a direct, lasting effect, not just an intellectual exercise.