Vipassana can be practiced independently, but samatha typically provides steadier conditions for insight to develop effectively.
Classical Theravada Buddhism, as presented in texts like the Visuddhimagga (Path of Purification), generally treats samatha (calm or concentration) as a necessary preliminary to vipassana (insight). The reasoning is practical: a mind that is scattered, agitated, or unstable cannot observe mental and physical phenomena with the clarity needed for insight. Samatha practices like meditation on the breath or a single object develop the mental stability and one-pointedness that make observation of impermanence, suffering, and non-self possible.
The Buddha's own path in the suttas shows him first achieving the four jhanas (deep concentration states) before developing insight into the three characteristics. This sequential approach became the template for much of Theravada practice, particularly in monastic contexts where samatha meditation was considered essential groundwork.
However, vipassana does not strictly require high-level samatha attainment. Many practitioners, particularly in modern contexts, develop meaningful insight without first cultivating jhanic states. The key distinction is between formal samatha practice and the baseline concentration necessary for mindfulness. A mind needs some stability to observe itself, but this stability can arise naturally through consistent vipassana practice itself.
Some teachers and traditions emphasize that vipassana, practiced with sustained attention, gradually generates its own steadiness. The Mahasi Sayadaw tradition of Burma, influential in contemporary practice, teaches a direct-to-vipassana method where practitioners observe bodily sensations and mental phenomena immediately, often skipping formal samatha training. This approach recognizes that the natural result of observing experience clearly is itself calming and concentrating.
Thai Forest Tradition teachers like Ajahn Chah and Ajahn Maha Boowa typically emphasize samatha development first, though they acknowledge that the boundary between the two practices is not absolute. In contrast, Goenka's Vipassana movement teaches a mixed approach: some samatha develops through the initial days of breath observation, but the emphasis quickly shifts to sweeping sensations across the body to generate insight.
Zen Buddhism largely sidesteps this debate by not organizing practice into these categories, though zazen (sitting meditation) incorporates both stabilization and direct seeing. The Tibetan tradition similarly integrates both, with shamatha (the Tibetan term for samatha) and vipashyana (insight) practiced in tandem or sequence depending on the school.
The Pali Canon does not present vipassana and samatha as absolutely inseparable. The Anapanasati Sutta describes breath meditation progressing through both samatha and vipassana phases. More importantly, the Kalama Sutta and other texts encourage direct investigation of experience, suggesting that insight can arise through careful attention regardless of prior concentration work.
Yet the Visuddhimagga and commentarial tradition do present the classical two-path model: one path develops samatha first, then uses it as a platform for vipassana; the other develops vipassana directly but still benefits from whatever concentration naturally arises. Both paths can lead to the same goal—the direct seeing of impermanence, unsatisfactoriness, and non-self that liberates.
In practice, most experienced teachers agree on this: some degree of mental stability helps vipassana become clearer and more stable. If your mind is chaotic, insight tends to be scattered. However, that stability can come from either formal samatha practice or from the natural settling that occurs when you practice vipassana consistently.
For beginners, spending time on preliminary concentration practice often prevents frustration and creates conditions where insight can be sustained. For others, jumping directly into observing sensations or thoughts works, particularly if they have some natural steadiness or are willing to practice longer to let stability develop naturally. The question is less about necessity and more about efficiency and personal circumstance.
Vipassana can be practiced without formal samatha training, but the relationship between them is synergistic rather than optional. The deepest insight typically arises when concentration and investigation work together. If you are starting out, developing some concentration first usually smooths the path. If you begin with vipassana, be patient—stability will develop alongside insight. Neither approach is wrong; both are found in authentic Buddhist traditions and both produce results.