Bhagavad Gita, Chapter 18, Verse 71

And even that man who hears this, full of Shraddhâ and free from malice, he too, liberated, shall attain to the happy worlds of those of righteous deeds.

Even simply listening, without full understanding, is named here as enough to earn a real, genuine benefit.

Krishna lowers the bar deliberately, faith and lack of envy, not intellectual mastery, are named as sufficient. Real access to this teaching's benefit is kept wide, not narrow.