What is jnana yoga in the Bhagavad Gita?

Jnana yoga — the yoga of knowledge — is the path Krishna develops in Chapter 4 of the Bhagavad Gita, titled Jñāna-Karma-Sannyāsa Yoga. Its central claim is that liberating knowledge is not information but a realization that dissolves the ego's sense of being the doer. Krishna gives it a striking image in verse 4.37: “As a blazing fire reduces wood to ashes, O Arjuna, so does the fire of knowledge (jñānāgni) reduce all actions to ashes.” Once you truly know the Self (atman) as distinct from the body and its activity, the binding force of karma is burned away — not because you stop acting, but because you stop claiming the actions as “mine.” This is why Chapter 4 pairs knowledge with action rather than opposing them. In verse 4.18 Krishna praises the sage “who sees inaction in action, and action in inaction” as wise among humans: the enlightened person may be fully engaged in the world yet inwardly unbound, while someone who withdraws in body may still be entangled in ego. Jnana yoga therefore completes, rather than replaces, the karma yoga of Chapter 3 — knowledge is what lets selfless action actually free you. How this “fire of knowledge” is kindled through study, discipline, and a genuine teacher is Chapter 4's practical heart.