A swimmer tries to stay afloat within a wave.

The World Between Breaths

Vanessa Zuisei Goddard on the famous Zen koan “Mu,” and how it helps us dive into buddhanature.

By Vanessa Zuisei Goddard

Untitled, Li Yang / Unsplash

It’s not night, yet it’s so dark down where she is that if she were to hold up her hand in front of her face, only the light of her lamp would help her recognize her palm, the line she has followed down, and not much else. It’s dark, and freezing, and though the light wetsuit she wears offers little protection against the cold, she doesn’t feel it. Rather, she’s not aware of the cold, nor of time, or space. She doesn’t remember, she doesn’t think, she doesn’t anticipate. All she knows is the weight of water. All she feels is its vastness and the blessed respite it gives her from her life above.

As she descends, the pressure of the ocean squeezes her lungs, the corresponding lack of air in them making her body heavier. This is how the ocean pulls her into its depths. This is how she lets it, not moving a single muscle, yet flying through the water in a perfect free fall. It’s not until she turns to begin her ascent that she exerts effort. She begins a slow and graceful dolphin kick that undulates through her body all the way to the tips of her fingers stretched overhead until, just before she reaches the surface, she lowers one hand and lets the last bit of momentum propel her back into the world of air and light.

What draws me to this art is the necessary focus and surrender and utter commitment to stillness it requires.

She takes a breath, her first in a while, looks around, then briefly closes her eyes, the silence below already calling to her again. Nowhere else does she know this depth of quiet. Nowhere else does she feel so irrevocably, so unquestionably right. It’s only in this world between two breaths where she knows herself as she really is: indivisible from water and everything that surrounds her. It’s only in this world where she knows, without question, she is perfect, and whole.

I do not free dive. Or rather, I don’t free dive in the ocean, although the concept fascinates me. It’s not the length of time that some of these athletes spend under water that impresses me most (over ten minutes in some cases), or the depth they reach (almost 370 feet). What draws me to this art is the necessary focus and surrender and utter commitment to stillness it requires. After all, these are the same qualities needed to execute a different kind of plunge: the dive into awakening or the realization of our true nature.

Both as a water lover and as a meditator, I well understand the allure of the depths—the place where there’s no sound, no thing; where there’s nothing but being, and that, only faintly. That’s why, for me, the figure of the free diver so perfectly captures the “immersion” we undergo in deep meditation. But I believe the metaphor becomes truly perfect in the instant when the diver breaks the surface of the water and is held suspended for a moment in both worlds: ocean and air—and by extension land and all it contains—or, in Buddhist terms, absolute and relative. That’s the moment in which we realize our buddhanature.

Buddhanature (Skt. buddhadhatu), or true nature, is a Mahayana teaching that encapsulates both the potential for buddhahood—our awakened nature—as well as its expression. It’s both who we are and what we’re trying to become; what is, indistinguishable from what can be. As thirteenth-century Zen master Dogen said, only a person of suchness (tathata; often used interchangeably with buddha­nature) can realize suchness. It’s only because we have the potential to awaken that we can actually do so. This seems obvious until we start to practice. Then frustration, doubt, disappointment, or boredom rear their heads and we start to wonder why we ever decided to commit to meditation. It’s in our struggle that what is perfect appears flawed, what is whole seems broken, and what is not only enough but immeasurable appears small and woefully inadequate. All of us have looked in the mirror at some point and thought, “I can’t. I’m not.”

This kind of self-doubt is excruciating in the best of circum­stances; at its worst, it can be crippling. In Zen, however, doubt can be harnessed into what is called “great doubt,” and this is exactly what “Mu,” arguably the most famous of all Zen koans, is meant to encourage: doubt so all-encompassing that it helps us to break through both conceptual thinking (in Sanskrit prapanca) and the emotional obstacles or kleshas that prevent us from seeing our buddhanature.

A monk once asked Master Zhaozhou,

“Does a dog have buddha nature or not?”

Zhaozhou answered, “Mu!”

“Mu” opens the Wumenguan or Gateless Gate, a record of forty-eight “public cases” or koans that thirteenth-century Chinese master Wumen Huikai used to teach his monks. Longer versions of this brief dialogue appear in other sources, but it’s this exchange that has come down to us through the ages as the “koan of koans,” the “gateless barrier of Zen,” and the “red hot iron ball” a student swallows but cannot cough up.

The monk, presumably a student of the great Master Zhaozhou, had to know that since the fifth century, the accepted teaching in all the various schools of Mahayana Buddhism was that buddhanature permeates all of reality. It’s the essence of both sentient and insentient beings—their bright, luminous nature. His question was therefore a challenge to his teacher or a thinly veiled expression of his own doubt. (“Dogs and cats may have buddha nature, but do I? Why don’t I know it, if it’s universal?”) In response, Zhaozhou simply said, “Mu,” presenting him and generations of Zen students with one of the most powerful, potentially transformative questions they would ever face in the form of the query “What is Mu?”

As is the case with other Buddhist teachings that have entered popular culture, koans are sometimes misunderstood. They’re neither riddles nor puzzles. They’re not nonsensical statements a teacher dangles before students to prod them to sit zazen. Koans are unique spiritual tools, and because “Mu” is usually the first case that a student takes up during their training, it has a potency that time and familiarity with a long series of koans can blunt. That first time, after spending months or years methodically developing concentration, a student is presented with a question that the intellect cannot meet—not in the way required to see through the heart of what “Mu” encapsulates, which is essentially the essence of our being.

“Begin by following Mu,” my teacher told me when he gave me the koan. “With each exhalation, silently recite Mu, letting that one word fill all of your body and mind as you sit. Don’t worry about what it means—this isn’t about meaning. Your job is to see Mu itself. And the only way to see Mu,” he said, leaning forward in his seat, “is to be Mu!” Then he rang his bell, sending me out of the dokusan room.

I diligently did what he told me, and after a while, he asked me to start questioning Mu. He repeated that the task was not to figure it out, but to realize it directly. At the time, I had no idea what he meant—I simply had no frame of reference for this kind of knowing. I’d trusted my intellect for far too long to let go of it easily and was used to working hard for anything I wanted to achieve. I didn’t know how to do less, know less, and let go of control. Predictably, it was a long ride.

It’s difficult to explain how Mu works to bring about the first glimpse into our buddhanature. You sit on your cushion going, “Mu, Mu, Mu,” periodically asking yourself what it is, and one day, seemingly out of the blue, you get an insight into the very fabric of the self and reality. It seems almost magical. But one simple way to think about how the koan works is in terms of a common metaphor for buddhanature: that of the sun obscured by clouds. The sun is ever present in the sky, always shining, always radiating heat, although sometimes we can’t see its light or feel its warmth. When our mind-sky is filled with clouds—our endless internal dialogue, our conflicting emotions, the many thoughts and beliefs that keep us firmly entrenched in a limited view of who we are—the sun is hidden and inaccessible. But when those clouds part through the practice of calming the mind (shamatha), then insight (vipashyana) into our ever present, bright, luminous nature has a chance to arise. The only point where this metaphor fails is that it seems to paint the clouds as obstacles—as hindrances that get in the way of our seeing clearly into who we are. And although on one level this is true, when the clouds do eventually part, we realize they were never a problem. Neither sun nor sky nor clouds obscure each other. How could they, when they are of the same nature? They are all perfectly, inarguably Mu—not obstacle, but gate.

Another quality of Mu is that its questioning forces you to be ever more intimate with yourself—with your moods, your thoughts, your beliefs. Because I spent a bit of time working on the koan, I had plenty of time to watch, and often struggle through, all sorts of mind states. First I was eager, then doubting, then indifferent. For a long period I was intensely afraid, but I couldn’t tell you why. I suffered through a bitchy period, where I could barely stand myself or others. And at one point, I clearly realized I was gay—not much of a realization, since everyone else seemed to know long before I did. It’s possible I would’ve seen it eventually without ever working on a single koan, but I think the opposite is less likely: it’s hard to remain closeted—unconsciously, at least—while spending day after day questioning who you are.

When I was finally able to see Mu, it was not surprisingly the image of water that helped me.

“Zuisei, do you realize you’re leaning?” one of the seniors at the monastery where I trained said to me after sesshin one day.


“Yes, like this,” he said, holding his hand up in front of his face at a forty-five-degree angle.

I hadn’t realized it, but the moment he said it, I flashed on something my teacher had said to me recently, “Sometimes it’s your very effort that stops you.”

I was trying too hard, I realized, and had been for some time. I had to relax into Mu, but how? I thought of those times when my body felt most at ease and immediately thought, Water. Then I proceeded to create a ritual for myself. Every time I took my seat for zazen, I imagined that with each consecutive hit of the timekeeper’s bell, I was slowly immersing myself in a clear pool of warm water. Ching! And I was in water up to my knees. Ching! Now it covered my chest. Ching! I was fully immersed, sitting at the bottom of the pool, and every molecule of water was Mu and every molecule in my body was also Mu. After a month of this, on the first full day of our next monthly sesshin, I saw it.

It took a while, but eventually I understood that if only I could trust that the bright, luminous nature of my mind was always present and shining, then all I had to do was get out of the way and let it. All I had to do was shift my way of seeing, my way of being.

In 1963, the physiologist Per Scholander discovered what he called the “Master Switch of Life,” a series of reflexive changes in the body that get triggered the moment a vertebrate animal dives. Also known as the “mammalian diving reflex,” it causes the redistribution of blood away from the extremities and toward the two organs that need the oxygenated blood the most: the brain and the heart. It also protects the lungs from collapsing under the water pressure. The trick—for free divers, at least—is to not give in to the panic of nonbreathing and relax into a different way of being, at least for a little while.

The koan “Mu” is like this Master Switch of Life: it shifts our minds from our “normal” cognitive processing to the direct apprehension of an object as it is. In other words, it shows us things directly, just as they are.

If, while working on Mu we can resist the impulse to panic about our confusion and instead profoundly relax into not knowing, then the answer will eventually reveal itself, because it was always there. Seeing Mu is therefore the extra-ordinary experience of recognizing who we are and who we have been from the beginning. To get there, what’s needed is trust in stillness and silence as deep and vast as the ocean. What’s needed is the faith that between one breath and the next, an entire world exists—that realm where we realize that what we’ve so long been looking for, we have always been.

A headshot of author and Buddhist teacher Vanessa Zuisei Goddard.

Vanessa Zuisei Goddard

Vanessa Zuisei Goddard is a writer and lay Zen teacher based in Panama City, Panama, as well as the guiding teacher for Ocean Mind Sangha, a virtual community of Buddhist practitioners. Her books include, Still Running: The Art of Meditation in Motion, and the children’s book Weather Any Storm. She can be found at Oceanmindsangha.org