Nearly everything so far has been Mahāyāna. Theravāda runs on a different line of transmission: the Pāli canon, Sri Lanka and Southeast Asia, and the living meditation traditions of Burma and Thailand.
It is not the "lesser vehicle." That label was applied from outside and is not a self-description. Its distinguishing feature is graduation — resolving liberation into stages that can be worked and checked, rather than establishing an all-embracing view first.
The framework running through the Visuddhimagga is the seven purifications: of discipline, of mind, of view, of overcoming doubt, of knowing what is and is not the path, of knowing the way of practice, and of knowledge and vision.
These are not descriptions of seven states but seven checkable stages, and they show the temperament of the tradition: rather than argue about the ultimate view, make the next step explicit.
This is the crucial distinction in Abhidhamma. Concepts (paññatti) are designations — table, self, time — and can be broken down further. Ultimates (paramattha) cannot: consciousness, mental factors, matter, nirvāṇa.
Consciousness is accordingly analyzed into 89 (or 121) types, with 52 mental factors that accompany them. Below that lies the mind-moment: consciousness arises, stands, and ceases in extremely rapid succession, and a complete cognitive process consists of a fixed series of seventeen such moments. What is called "a thought" is a stream of countless moments. Impermanence is here resolved to its finest grain.
Vipassanā goes past the calm of concentration to observe body and mind as they are, seeing the three marks — impermanence, unsatisfactoriness, non-self.
The wisdom section of the Visuddhimagga lists sixteen insight knowledges, pivoting on the knowledge of arising and passing away — directly seeing each phenomenon arise and vanish. The weight is on seeing: this is not a conclusion reached by reasoning.
The last century saw a revival of insight practice in Burma. Ledi Sayadaw brought it to lay practitioners; the Mahasi method takes the rise and fall of the abdomen as primary object and uses mental noting; the U Ba Khin and Goenka method sweeps bodily sensation and trains non-reaction to pleasant and unpleasant feeling. Different in method, identical in aim.
The Visuddhimagga is Buddhaghosa's encyclopedia of practice, assembled from the commentarial tradition of the Mahāvihāra and standard for Pāli Buddhism as a whole.
The Abhidhammattha-saṅgaha is Anuruddha's compendium, for a thousand years the first Abhidhamma textbook of Theravāda students.
The section on insight and the knowledge of arising and passing covers practice and distinguishes the main contemporary systems.
The Satipaṭṭhāna Sutta (Majjhima 10) supplies the canonical source for the other three. It largely coincides with the Mahāsatipaṭṭhāna Sutta (Dīgha 22) read on Day 12, which expands the four noble truths under the fourth establishment — one concise, one extended, two recensions of one teaching.
The Visuddhimagga is Theravada's encyclopedia of practice. Buddhaghosa synthesized generations of Mahāvihāra commentary into the definitive standard for the doctrine and practice of the entire Pali tradition.
It opens into three great parts along the three trainings—virtue (sīla), concentration (samādhi), wisdom (paññā). The concentration section catalogs forty meditation subjects (breath, foulness, the divine abodes, the kasiṇas) and the jhānas; the wisdom section contemplates the aggregates, elements, faculties, truths, and dependent origination, up to Nibbāna.
Running through it is the sequence of seven purifications—from purification of virtue and of mind onward through purity of view, of overcoming doubt, and so on—breaking the path into an operational, self-verifiable engineered ladder. This is Theravada's hallmark of graded clarity.
With cognitive training: the virtue-concentration-wisdom sequence maps to the modern "constraint—focus—insight" layering of skill acquisition. Set environmental limits to cut distraction (virtue), train stable attention (concentration), and only then can insight arise (wisdom). Skipping the first two to chase "sudden awakening" is mostly fantasy.
With attention neuroscience: the progression from "access concentration" to "absorption" tracks the attentional shift from wavering to lock-on; the forty subjects amount to a validated library of attention-training protocols.
Traditional: a practitioner selects one meditation subject per the Visuddhimagga, first purifies conduct, develops concentration to the corresponding jhāna, then turns to insight—all verified by a teacher.
Modern: transplant virtue-concentration-wisdom into your workflow—virtue: silence notifications, carve out a do-not-disturb block; concentration: 90 minutes of single-threaded deep work; wisdom: a calm retrospective seeing exactly how the mind got pulled away. One loop of three beats shouting "focus!" at yourself.
The seven books of the Abhidhamma Piṭaka are vast; this work is Anuruddha's distilled handbook, for a millennium the first textbook of Abhidhamma for Theravada monastics.
Its core distinction is between concept (paññatti) and ultimate reality (paramattha): table, self, and time are merely nominal concepts, further divisible; but consciousness, mental factors, matter, and Nibbāna are indivisible "ultimates"—a thoroughgoing reductive analysis. Consciousness is analyzed into 89 (or 121) types, with 52 associated mental factors (contact, feeling, perception, volition, greed, hatred, wisdom...).
Its subtlest teaching is the mind-moment (cittakkhaṇa): mind flows as an ultra-rapid succession of arising-persisting-vanishing instants, one cognitive process built of a fixed sequence of seventeen mind-moments. What we call "a single thought" is a torrent of momentary minds—impermanence dissected to its finest grain.
With consciousness studies: the succession of mind-moments echoes the discrete-frame hypothesis—cognitive science suggests perception may not be a continuous stream but updates in "perceptual moments" of tens of milliseconds. Two millennia ago, Abhidhamma had already deconstructed the "continuous self" into a sequence of instants.
With phenomenology: "ultimate vs. conceptual" approaches Husserl's phenomenological reduction—bracketing the natural attitude of a "substantial self," leaving only the mind-and-matter elements as they present now. The difference: Abhidhamma also deconstructs the "self that reduces."
Traditional: using Abhidhamma as a "map of mind," the meditator identifies in real time: "Which consciousness arises now? Which mental factors accompany it? Wholesome or unwholesome?"
Modern: when emotion surges, don't say "I'm upset"; parse it with the language of mental factors: "This is hatred (resistance), with restlessness (agitation) and a trace of conceit (feeling wronged)." Resolving a chaotic emotion into a few observable "dhammas" instantly loosens it from "me" into an observed object.
Insight (vipassanā) is Theravada's core method: beyond the calming of serenity meditation (samatha), it uses a stable mind to observe reality as it is—seeing the three marks of impermanence, suffering, and non-self.
The Visuddhimagga's wisdom section lists sixteen insight knowledges, pivoting on the "knowledge of arising and passing (udayabbaya)"—directly witnessing each phenomenon arise and vanish moment by moment, and thence turning toward dispassion and liberation. This is not an inferred "impermanence" but one seen with one's own eyes.
Over the last century Burma sparked an insight revival: Ledi Sayadaw brought vipassanā to lay people; the Mahasi method takes the rise-and-fall of the abdomen as primary object and uses mental "noting"; the U Ba Khin–Goenka method sweeps bodily sensations (vedanā) and makes "non-reaction" to pleasant/unpleasant feeling the key. Different methods, one goal: direct seeing of the three marks.
With interoception: Goenka's "scanning bodily sensations" directly trains awareness of internal signals, localized in the brain to the insula. Studies show long-term insight practitioners have more active insulae and stronger emotion regulation—observing sensations arise and pass reshapes the body map.
With predictive coding: "non-reaction to feeling" severs the automatic chain "feeling → craving/aversion → action," matching the neural idea of interrupting the habitual predict-react loop: starve the prediction and the old pattern fades.
Traditional: in retreat, meditators alternate sitting and walking ten hours a day, scanning or noting, never conversing with thoughts, only watching them arise and pass.
Modern: ten minutes of body-scan daily—move attention slowly head to foot; meeting itch, ache, tightness, or numbness, only observe its arising and fading, neither grasping nor pushing away. When you watch an "unbearable" itch rise and pass on its own, you loosen your grip once on the iron law that "urges must be satisfied"—a steadiness that transfers to every "I can't help it" at work and in parenting.
The Satipaṭṭhāna Sutta is the foundational text of Theravada meditation, giving the Buddha's own source for the preceding three (commentary, Abhidhamma, insight). The opening term "ekāyana" has been read as "the only path," "the direct path," and "the path going to the one (Nibbāna)"—all pointing to its pivotal role in liberation.
The four foundations are four fields of contemplation: body (breath, postures, body parts, foulness, four elements), feeling (pleasant, unpleasant, neutral), mind (states such as with/without greed, scattered/collected), and dhammas (the five hindrances, five aggregates, six sense bases, seven awakening factors, four truths). From coarse to subtle, outer to inner.
Worth distinguishing: this discourse (MN 10) and the Mahāsatipaṭṭhāna Sutta of Day 12 (DN 22) are largely identical, except the latter expands the analysis of the four noble truths under dhamma-contemplation. One concise, one extended—two recensions of the same teaching, which Theravada takes as the operational blueprint for joined serenity-and-insight.
With affective neuroscience: "contemplation of feeling" isolates vedanā—the raw hedonic tone of pleasant/unpleasant/neutral—for observation, matching science's core affect, the valence dimension prior to any named emotion. Catching feeling before the story is the best cut-point for breaking the emotion chain.
With metacognition: "contemplation of mind" is awareness of "what state mind is in now," i.e., metacognitive monitoring—stepping back to watch the thought rather than being lost in its content. This is the ancient prototype of "decentering" in psychotherapy.
Traditional: the practitioner follows the four in sequence—settling in the body (breath), observing feeling when disturbed, then the mind's greed and scatter, and finally seeing the five hindrances arise and pass under dhamma-contemplation.
Modern: in the instant of conflict, when anger rises, run a miniature four-foundations pass: body—notice the breath quickening, shoulders tightening; feeling—recognize this as an "unpleasant feeling"; mind—see that "aversion has arisen"; dhammas—recall "this is the hindrance of aversion, impermanent, it will pass." Four steps done, you have often switched from reaction to observation, and words won't fly out to wound.