Abhidhamma teaches that intention (cetana) is the core of karma, the mental factor that directs all volitional action and creates consequences.
The Abhidhamma, Buddhism's analytical philosophical texts, builds directly on the Buddha's own teaching that intention (cetana in Pali) is karma itself. In the Abhidhamma Pitaka, particularly the Dhammasangani (enumeration of phenomena), intention is identified as a mental factor present in every moment of consciousness that involves volitional action. This is not a casual or passing mental state—intention is the active directing force that shapes both the quality of an action and its karmic consequences.
The Abhidhamma goes further than the suttas by systematizing exactly which mental factors accompany intention in different types of consciousness. When intention arises with greed, hatred, or delusion, it produces unwholesome karma. When it arises with generosity, compassion, or wisdom, it produces wholesome karma. The Abhidhamma treats this relationship with mathematical precision, cataloging which mental factors must co-arise for different karmic outcomes.
In Abhidhamma psychology, consciousness arises in extremely brief moments, and intention is woven into each one. The Vibhanga (book of analysis) explains that intention operates within the stream of consciousness, determining the nature of each mental event. What makes an action karmic, according to Abhidhamma, is precisely this intentional component—the deliberate direction of the mind toward an object.
This framework clarifies why the same physical act can have radically different karmic weight depending on intention. Killing an insect while sweeping a room unintentionally produces no karma, whereas killing it deliberately does. The Abhidhamma explains this by pointing to the presence or absence of intention as a conditioning mental factor. The intentional moment of consciousness is what carries karmic weight across time.
The Abhidhamma organizes karma into three paths of action: bodily action, speech, and mental action. Intention operates distinctly in each. For bodily and verbal actions, intention must precede the physical or vocal expression—intention causes the action. For mental action, intention itself is the action, since thought requires no external expression. This tripartite analysis allows the Abhidhamma to show how intention is the unifying principle across all three domains.
The Dhammasangani maps out which wholesome and unwholesome mental factors must be present alongside intention for each type of action. A generous action requires intention paired with non-greed and non-hatred. A harmful action requires intention paired with greed, hatred, or delusion. The Abhidhamma is systematic and exhaustive in this mapping.
The Abhidhamma describes how intention creates consequences through the doctrine of vipaka, or ripening. Actions shaped by intention don't simply disappear—they shape the intentional quality of future consciousness. Wholesome intentions develop capacities for generosity, compassion, and clear thinking. Unwholesome intentions strengthen greed, aversion, and confusion. These become habitual patterns that color future consciousness moments.
The Patthana (book of conditions) explains how intention acts as a conditioning factor in this process. Past intentions condition present consciousness, not through a permanent self carrying experiences, but through the continuous unfolding of conditional relationships. Each intentional action sets up conditions that influence the next moment of consciousness and the broader patterns of one's mind.
The Theravada tradition maintains the Abhidhamma's original emphasis on intention as the defining karmic factor. Later Buddhist schools adapted this framework differently. Mahayana philosophy, while accepting intention's centrality, developed more elaborate theories of karma operating across multiple lifetimes and dimensions. Some Mahayana texts emphasize the role of the subconscious mind and seeds (bija) in karmic development, adding layers of analysis the Pali Abhidhamma does not explore.
Tibetan Buddhist commentaries on Abhidhamma, particularly in the Gelug school, provide detailed logical analysis of exactly how intention relates to karma's effects. They preserve the Abhidhamma's analytical precision while engaging with broader philosophical questions about the nature of causality. The core insight—that intention is karma—remains consistent across these interpretations, though the explanatory framework expands.