Theravada prioritizes the Buddha's direct teachings as the purest source of doctrine, viewing later commentaries as helpful but secondary interpretations.
Theravada Buddhism grounds itself in the Pali Canon, a collection of texts preserved in the Pali language that Theravadins believe represents the Buddha's actual words most faithfully. These texts were orally transmitted for several centuries after the Buddha's death before being written down, likely around the first century BCE. The Canon consists of the Vinaya (monastic rules), the Suttas (discourses), and the Abhidhamma (philosophical analysis), and Theravadins treat them as the primary source of Buddhist doctrine.
This emphasis reflects a deliberate choice: when faced with multiple interpretations of Buddhist teaching, Theravadins return to what they consider the earliest, most direct testimony. The Buddha himself advised his followers in the Kalama Sutta to test teachings through direct experience and reason rather than accepting them on authority alone, which Theravadins interpret as supporting their focus on foundational texts over later elaborations.
Theravada does preserve extensive commentaries, primarily those attributed to Buddhaghosa (fifth century CE) and later scholars. However, these commentaries are explicitly classified differently from the Canon itself. They serve as tools for understanding difficult passages, providing historical context, and resolving ambiguities, but they carry less doctrinal weight.
This distinction matters practically. When a question arises about Buddhist teaching, a Theravada scholar will first consult the Canon itself. Only if the Canon is unclear does one turn to commentarial material. This hierarchy prevents commentaries from drifting Buddhist doctrine away from its presumed origins. Theravadins acknowledge that commentaries contain insights and useful explanations, but they remain subordinate to the Buddha's teaching as recorded in the suttas.
Theravada's emphasis reflects its self-understanding as a conservative tradition committed to preserving the Buddha's original teaching without substantial additions. The Theravada school traces its lineage back to the original sangha and maintains that its core doctrines have remained essentially unchanged. This identity depends on maintaining that the Canon represents authentic Buddhist teaching rather than later interpretations.
In contrast, other Buddhist traditions—particularly Mahayana schools—developed additional scriptures they consider equally authoritative, such as the Lotus Sutra or Pure Land texts. Theravada sees these additions as departures from the Buddha's actual teaching, which is partly why it emphasizes textual primacy. The emphasis on the historical Buddha's words becomes a marker distinguishing Theravada's conservative approach from other traditions' more expansive canons.
The Vinaya, the monastic code found in the Canon, governs Theravada's sangha directly. These rules are attributed to the Buddha himself and remain binding on monks and nuns. Because the Vinaya derives its authority from being the Buddha's direct guidance, commentaries on monastic discipline serve primarily to clarify application rather than to establish new rules.
This practical dimension reinforces the broader principle: the Canon's words carry authority because they originate from the Buddha. Later interpretations help communities apply those words, but they do not replace them. A monastic rule cannot be overturned by commentary; it can only be clarified or contextualized.
It is worth noting that different Theravada schools—Sinhalese, Thai, Burmese, and Cambodian traditions—do sometimes appeal to different commentarial sources or weight them differently. Thai Buddhism, for instance, incorporates local practices and texts that other Theravada communities might view as innovations. However, all Theravada traditions agree that the Pali Canon remains the authoritative standard against which later developments must be measured.
This creates a useful tension: Theravada can accommodate some doctrinal diversity and local adaptation while maintaining that any authentic Buddhist practice must cohere with the Canon's teachings. The historical Buddha's words, as preserved in the Pali texts, remain the final reference point.