In Buddhist meditation, the Fourth Jhana (Catuttha Jhana) is considered the pinnacle of "fine-material" concentration. It is a state of profound stillness and neutrality, where the emotional "peaks and valleys" of previous stages have completely leveled out.

The Buddha often described this state as the ideal foundation for gaining deep insight or developing "super-normal" mental powers because the mind is at its most stable and "pliable."

The Defining Factors

In the transition from the Third to the Fourth Jhana, the meditator lets go of even the subtle sense of physical pleasure (sukha). What remains are two primary mental factors:

• Equanimity (Upekkha): This is not a state of "numbness" but a radical, balanced neutrality. The mind is no longer pulled toward pleasure or pushed away by pain.
• One-Pointedness (Ekaggata): The mind is unified and completely steady on its object. It is often described as a "still, bright flame" in a windless room.

Key Characteristics of the Experience

The Fourth Jhana is distinct from the earlier stages because of its "purity." Traditional texts and practitioners highlight several specific qualities:

• Beyond Pleasure and Pain: The meditator has abandoned both physical pleasure (sukha) and mental joy (piti), as well as their opposites (pain and grief). It is a "neither-pleasant-nor-painful" feeling.
• Purity of Mindfulness: Because the mind is no longer distracted by the "noise" of pleasure or the "vibration" of rapture, mindfulness becomes exceptionally clear and sharp. This is often called upekkhā-sati-pārisuddhi (purity of mindfulness due to equanimity).
• Radiant Stillness: Many practitioners describe a sense of bright, pervasive light or a "motionless" awareness. It feels like breathing "air from another world"—a state of utter calm and crystalline clarity.
• Physical Quietude: The breath becomes extremely subtle, sometimes appearing to stop entirely (though internally, the body remains energized by the concentration).

Comparison of the Jhana Progressions

To see how the Fourth Jhana fits into the sequence, it helps to look at what is "dropped" at each stage:

Jhana Level	Factors Present	What is Abandoned
First	Thought, Evaluation, Rapture, Pleasure, Unification	Sensory Desires / Hindrances
Second	Rapture, Pleasure, Unification	Applied & Sustained Thought
Third	Pleasure, Equanimity, Mindfulness, Unification	Rapture (Piti)
Fourth	Equanimity, Pure Mindfulness, Unification	Pleasure (Sukha) & Pain

Why it Matters

The Fourth Jhana is often called the "doorway" to the higher states. From here, a meditator can move into the Formless Realms (like Infinite Space) or turn the mind toward Vipassana (insight) to see the true nature of reality. Because the mind is no longer "reacting" to anything, it can observe phenomena with absolute objectivity.