Bhagavad Gita, Chapter 18, Verse 30

That which knows the paths of work and renunciation, right and wrong action, fear and fearlessness, bondage and liberation, that intellect, O Pârtha, is Sâttvika.

Real discernment is defined here through four specific, paired distinctions, not a vague sense of good judgment.

Knowing what's proper, what's duty, what's genuinely fearful, and what actually liberates gives this intellect real, practical shape. Clarity here isn't abstract, it's usable.