The Sarvastivada (सर्वास्तिवाद - Sarvāstivāda, literally meaning Doctrine That All Exists; rendered in Tibetan as ཐམས་ཅད་ཡོད་པར་སྨྲ་བ། thams cad yod par smra ba Tamché Yöpar Mawa; and in Chinese as 说一切有部 / 說一切有部 - Shuo Yiqieyou Bu, universally revered across India, Kashmir, Mathura, Gandhara, Central Asia, Tibet, China, Korea, Japan, and the global Buddhist world as one of the most influential and intellectually sophisticated early Nikaya schools of Indian Buddhism), acclaimed throughout Asian Buddhist history since the 3rd century BCE as the premier analytical tradition of Abhidharma philosophy and psychology, stands as a foundational pillar of world Buddhism. Grounded in the teachings of Shakyamuni Buddha (c. 563–483 BCE) regarding anicca, dukkha, and anatta, fearless renunciation, and unshakeable refuge in the Buddha, the Dharma, and the Sangha, the Sarvastivada tradition systematized ethical conduct, precepts, meditation, mindfulness, concentration, and liberating wisdom on the path of the Shravaka and Arhat toward awakening and nirvana.

Historically and geographically, the Sarvastivada emerged during the 3rd century BCE following the Third Buddhist Council at Pataliputra under Emperor Ashoka (r. c. 268–232 BCE), when the Elder Moggaliputta Tissa refuted the doctrine of temporal eternalism and the Sarvastivada masters—led by Madhyantika and Upagupta—migrated northwestward to establish flourishing monastic centers across Mathura, Gandhara, and above all Kashmir in northern India. Under the powerful royal patronage of the Kushan Emperor Kanishka in the 2nd century CE, five hundred Sarvastivada Arhats and scholars—including Vasumitra, Parshva, and Ashvaghosha—convened the Fourth Buddhist Council in Kashmir, compiling the monumental Abhidharma Mahavibhasha Shastra (Taisho Number 1545 in the Chinese Tripitaka) and inaugurating the orthodox Kashmiri Vaibhashika lineage.

Doctrinally and philosophically, the defining tenet of the Sarvastivada—encapsulated in its name (“all exists,” sarvam asti)—is its sophisticated theory of temporal realism, asserting that while conditioned phenomena (samskrita dharmas) only exercise causal efficacy (karitra) in the present moment, their intrinsic defining essence (svabhava) exists across all three times: past, present, and future. Through this framework, Sarvastivada masters solved pressing philosophical problems regarding how past karma can ripen into future results, how memory operates, and how the mind takes past or future events as objects of cognition, while simultaneously maintaining strict adherence to anatta (no enduring personal self) by analyzing all experience into seventy-five fundamental, momentary dharmas categorized across the five aggregates (rupa, vedana, samjna, samskara, and vijnana).

Canonically and literarily, the Sarvastivada preserved a complete Tripitaka composed in Sanskrit and Buddhist Hybrid Sanskrit—featuring its own Vinaya Pitaka (the Dashabhanavara Vinaya, Taisho Number 1435 in the Chinese Tripitaka), its Sutra Pitaka structured into four Agama collections (Dirgha Agama, Madhyama Agama, Samyukta Agama, and Ekottara Agama), and its famed seven-text Abhidharma Pitaka, comprising the Jnanaprasthana by Katyayaniputra (Taisho Number 1544) along with six supporting “feet” (padas): the Sangitiparyaya (Taisho Number 1536), Dharmaskandha (Taisho Number 1537), Prajnaptishastra (Taisho Number 1538, and Toh Number 4086 in the Tibetan Tripitaka), Vijnanakaya (Taisho Number 1539), Dhatukaya (Taisho Number 1540), and Prakaranapada (Taisho Number 1542).

In the 4th century and 5th century, the Sarvastivada-Vaibhashika system was masterfully summarized, analyzed, and critically refined by the great Indian master Vasubandhu (c. 320–400) in his immortal Abhidharmakosakarika (Toh Number 4089 in the Tibetan Tripitaka, and Taisho Number 1558 in the Chinese Tripitaka) and its auto-commentary, the Abhidharmakosabhasya (Toh Number 4090, and Taisho Number 1558), alongside the orthodox Vaibhashika defense Nyayanusara Shastra (Taisho Number 1562) composed by Samghabhadra (5th century)—texts translated into Chinese by Paramartha and Xuanzang (602–664) and into Tibetan by Jinamitra, Kawa Paltsek, and Yeshe De.

Across Central Asia and China, the Sarvastivada thrived along the northern Silk Road oasis kingdoms of Kucha, Turfan, and Khotan, transmitting crucial meditative manuals on breathing mindfulness (Anapanasmriti) and visualization that directly catalyzed the rise of early Mahayana and Yogacara practice—while its northern redaction, the Mulasarvastivada, became the unbroken monastic ordination lineage of Tibet, Nepal, Bhutan, and Mongolia.

Philosophically and contemplatively, the Sarvastivada's rigorous taxonomy of mental factors, afflictions, and causal laws served as the essential analytical foil and training ground for Nagarjuna's Madhyamaka dialectics regarding emptiness (शून्यता - śūnyatā; སྟོང་པ་ཉིད། stong pa nyid Tongpanyid) and dependent origination, Asanga and Vasubandhu's Yogacara phenomenology, and innate Buddha-nature (tathagatagarbha) aligned with Maitreya's Uttaratantra Shastra (Toh Number 4024, and Taisho Number 1611). Guiding practitioners to sever attachment to emptiness of self and cyclic rebirth across samsara and nirvana, the tradition anchors every contemplative step in Shakyamuni Buddha's Four Noble Truths, the Noble Eightfold Path, generosity, merit, loving-kindness, compassion, equanimity, right view, non-attachment, skillful means, and universal bodhicitta to extinguish the three poisons across the six realms.

Studied daily through Vasubandhu's Abhidharmakosabhasya across monastic universities in Tibet, India, Nepal, Bhutan, Mongolia, China, Japan, Korea, and the Western world into the 21st century, the Sarvastivada stands forever as the towering analytical foundation upon which Mahayana philosophy illuminated the Middle Way to complete Buddhahood.