Reading Map · Nine Stretches of Road, One Gate

This book is a road.

On a long walk, it steadies you to have a map in your hand—to know which stretch you are on, what lies ahead, and what this stretch is for. This reading map is the map of that road.

The book has nine parts and thirty-one chapters, plus eight short "transitions" between the nine stretches of road. The road sets out from the first jhāna a boy entered untaught beneath the rose-apple tree, and walks all the way to that machine in today's pocket that contends for your attention. But whichever stretch you are on, what walks this road is always the same one thing—concentration: how, from a ladder one thought one had to climb, it is recognized as a subtraction that sets things down rung by rung; how it is set up, woven into the path, systematized, read as non-abiding, dissolved, set against its mirror, taken apart, gathered into the whole—and at the last, at its deepest point, opened back, toward wisdom.

Below, I will point out the nine stretches of road to you, one by one. You need not memorize them; a sense of direction in your heart is enough.

The Shape of the Road

The first three parts (Parts One through Three) are the roots: first the word "concentration" is made clear (the three Pāli words and the scale); then we look at its place on the path (the Āgamas' right concentration); then we enter the treatise-masters' workshop to see how finely it was dissected (the Abhidharma). These three parts raise the spine of the whole book—the ladder of the four jhānas, and the subtraction by which the jhāna-factors fall away layer by layer.

The middle two parts (Parts Four and Five) are the turn and the cut: the Mahāyāna turns concentration toward the benefit of others—deep in absorption, yet deliberately reborn back in the desire-realm; prajñā then turns around and cuts off all clinging to concentration—cuts its flavor, cuts its attachment, and all comes home to one great silence.

The three parts after that (Parts Six through Eight) are the peaks of the Chinese land: the Śūraṅgama establishes a great samādhi already complete from the first, together with its entrance (the precept), its path (the perfect penetration), and the full map of its forks (the skandha-māras); the Chan school gathers concentration down to the smallness of a single thought; the Lotus and the Huayan open it out to the largeness of the dharma-realm—gathering and opening, the two poles, bearing witness to one same spine.

The last part (Part Nine) is the road home: bringing the whole road back to today, back into your daily use, and closing the volume—concentration returns to prajñā.

Nine stretches of road, one main line: concentration is recognized from a ladder into subtraction, from an attainment into a gate of practice, from a sitting posture into the living concentration; it is let out from the single thought to the dharma-realm; and at the last it is willing to be the sealed chamber, turned over toward the lamp of wisdom. At the end of this main line, this series sets the volume beside one sentence of the Heart Sūtra—"the bodhisattva, in dependence on the perfection of wisdom … ultimate nirvāṇa." This is the Six Practice Gates' own arrangement of correspondences: after the precept gate has stood the boundary firm, the concentration gate gathers inward, and comes to rest at the bodhisattva's ultimate nirvāṇa, leaving the attaining of anuttarā-samyak-saṃbodhi reverently to the last gate.

The Nine Stretches, One by One

Part One · Pāli Roots · Getting Clear About the Word "Concentration"

The start of the road: back to the root of the word. The first chapter, "Samādhi, Samatha, Jhāna," first pulls apart three words long tangled together in Chinese—they are three words, not one. The second chapter, "The Rose-Apple Tree and the Two Teachers," is the founding scene of the whole book: the boy's first jhāna, the two teachers' formless attainments, and the Buddha's sentence, "this dharma does not tend toward nirvāṇa"—the seed is planted here. The third chapter, "Two Tracks, One Vehicle," sets up the twin tracks of calm and insight: concentration and wisdom bearing one yoke together, neither a substitute for the other. The fourth chapter, "The Scale of Concentration," lays out the vertical axis of the four jhānas and the four formless attainments—at every step up, one thing is set down; concentration has been subtraction from the very start. The fifth chapter, "Forty Doors," looks at the entrance map of calm: the meditation-subject (kammaṭṭhāna), the learning-sign, access and absorption.

Part Two · The Āgama View · Concentration's Place on the Path

The first chapter, "Right Concentration," watches the same four jhānas serve as the eighth limb of the noble eightfold path—concentration woven into the path, mindfulness before it as its support, view behind it gathering it in: of itself, it points elsewhere. The second chapter, "The Channel Forms When the Water Arrives," walks that famous chain: keeping the precepts, non-regret, joy, rapture, tranquility, happiness, concentration—concentration is not forced out; it arrives with the current. The third chapter, "The Five Hindrances," comes to know the five regular guests that concentration counters, and the exact measure of the word "seclusion."

Part Three · The Treatise-Masters' Workshop · How Finely Concentration Was Dissected

The first chapter, "Matching the Remedy to the Illness," watches the meditation-subjects assigned by temperament—the person of greed-temperament has a gate of his own; the person of hate-temperament, a gate of his own. The second chapter, "Noble Silence," goes inside the jhāna-factors: applied thought, sustained thought, rapture, and ease taken apart one by one, and why the second jhāna bears the name "noble silence." The third chapter, "The Substance of Absorption," asks all the way down: what, in the end, is concentration's own nature? The two schools answer differently—and that balance stays hanging until Part Five sets it down.

Part Four · The Mahāyāna Turn · The Same Ladder, Facing the Other Way

The first chapter, "The Perfection of Dhyāna," watches concentration become one of the six perfections—"If I were reborn by dhyāna, I could not benefit beings widely": the bodhisattva's concentration is cultivated for the sake of beings. The second chapter, "The Nine Stages of Mental Abiding," watches the Yogācāra school model calm into nine graduations, six powers, and four kinds of attention—and the bodhisattva's astonishing stroke: to "deliberately and after reflection choose to be reborn back in the desire-realm." The third chapter, "The Concentration That Does Not Abide," establishes mastery in entering and leaving: able to enter, able to leave, never glued fast to concentration. The fourth chapter, "Pulling One Corner of the Robe," first meets the great roster of the hundred-and-eight samādhis—the Heroic-March and the Ocean-Seal, two seeds buried here.

Part Five · Prajñā and Concentration · The Sword Leaves Its Sheath

The first chapter, "The Marks of Concentration Are Empty," cuts the coarse clinging: the one stuck fast to the sweetness and the one stuck fast to the stillness are undone by one and the same stroke—searched for everywhere, and not to be found at all. The second chapter, "Mañjuśrī's Sword," cuts the subtle clinging: dharma-attachment, the conceit of false attainment, "I am pure, others are defiled"—until even the sword that does the cutting is itself, at the last, empty. The third chapter, "Vimalakīrti's One Silence," returns the sword to its sheath: the posture of sitting stripped away, verbal explanation handed back—one silence like thunder, and five thousand realize the forbearance.

Part Six · The Śūraṅgama · A Great Samādhi Complete from the First

The first chapter, "Gathering In the Mind Is the Precept," finds the entrance to the great samādhi set, unexpectedly, upon the precept—the precept is the first portion of the gathering-in, and sand cannot be steamed into rice. The second chapter, "Turning the Hearing Back to Hear Its Own Nature," hears the twenty-five sages each tell their own gateway, and Mañjuśrī pick out the one most ingenious for this world—turning the faculty back, entering the stream: the return to the source is not two; the gates of expedient means are many. The third chapter, "The Fifty Skandha-Māras," is the full map of the forks: the states themselves are without fault; only construing them as sagehood lets in the host of māras—form no notion of sagehood, and it is a good state.

Part Seven · Chan · Gathering Concentration Back into the Present Thought

The greatest single reconstruction on Chinese soil: five chapters, one spine. The first chapter, "Pacifying the Mind," watches Bodhidharma name concentration "pacifying the mind"—from then on, it stands no longer on the ladder of the four jhānas and eight attainments. The second chapter, "Sudden and Gradual," reads two verses, two ways of reading concentration—yet the Dharma has no sudden or gradual; persons have sharp or dull faculties. The third chapter, "Silent Illumination," watches Hongzhi sit concentration and wisdom into a single simultaneous posture—when illumination loses its silence, intrusion appears; when silence loses its illumination, it all becomes leftover dharma. The fourth chapter, "Watching the Head of Speech," watches Dahui press it into a single ball of fire—turning the light back, the doubt breaking through to the source of seeing. The fifth chapter, "Concentration and Wisdom, Not Two," is where four streams converge: the living concentration that is amid signs, free of signs—"if, seeing all objects, the mind is unconfused—that is true concentration."

Part Eight · Lotus and Huayan · Concentration's Two Outward Reaches

The first chapter, "The Concentration of the Peaceful Practice," watches the Lotus spread concentration across the whole of deportment—in all four postures, the mind is ever in concentration; one governs amid violence and is at peace amid alarm. The second chapter, "The Ocean-Seal Samādhi," watches the Huayan push concentration out to the dharma-realm—in a single thought-moment it pervades the ten directions, and in each and every mote of dust Samantabhadra enters together; Fazang judges it the essential body of the whole teaching. The Chan that gathers to the smallest and the Huayan that opens to the largest here see each other face to face: the single thought and the dharma-realm were never apart.

Part Nine · The Modern Return · The People of Today Step In

The first chapter, "Two Failure Modes," diagnoses today's two faces: the one who uses concentration as a stress-relief button, and the one who hides inside the quiet—two sides of one and the same fissure, and the medicine has but one flavor: neither relished nor blindly attained. The second chapter, "Concentration in the Age of AI," looks at the new outer condition the ancients never had: it is a condition, not a cause; it can favor, it can oppose—and what judges favoring from opposing is wisdom. The third chapter, "The Inward Gate Opens Back," closes the whole volume: it returns to the scene at the volume's opening, surveys the nine parts in one look, and the round of the three trainings comes round and closes—the deepest concentration is one in which even the state of concentration is ungraspable.

How to Read This Book

Reading from beginning to end, in order, is the way this book was designed to be read—the eight transitions between the nine stretches are the breathing-spaces laid down for continuous reading. If you want only a single ladleful: to get clear about the word "concentration," read Part One; if you often meet states in sitting and feel no ground under you, read the third chapter of Part Six; if you have heard of Chan investigation but never quite understood it, read Part Seven; if you suspect you have turned sitting into a tool, read the first chapter of Part Nine. But wherever you enter, please walk at the last to the third chapter of Part Nine—the place where that door opens back is where this book truly means to bring you.

The road is just ahead. It begins in the shade of that rose-apple tree.