Karma operates through a continuous stream of consciousness, not a permanent self, where actions condition future experiences within a causal process.
Buddhism teaches anatman—the absence of a permanent, unchanging self—yet also teaches karma, the principle that actions have consequences. This seems contradictory: if there's no self to experience results, how can past actions affect future circumstances? The Buddha explicitly addressed this puzzle. In the Milinda Panha (Questions of King Milinda), the monk Nagasena compares karma to a fire: when you light a flame from one candle to another, no "thing" passes between them, yet the flame transfers. Similarly, actions produce consequences without requiring a permanent entity to carry them forward.
The key is understanding that Buddhism denies a static self, not causality itself. Actions genuinely produce results through natural law, not through a soul or essence that persists unchanged. What connects past actions to future circumstances is the unbroken continuity of a causally conditioned process.
Rather than a permanent self, Buddhist philosophy describes a continuous stream of moments of consciousness (vijñana-santana in Sanskrit). Each moment arises dependent on preceding conditions and itself becomes a condition for subsequent moments. This stream is neither identical nor entirely separate from previous moments—it maintains continuity through dependent origination (pratityasamutpada), the doctrine that all phenomena arise through interconnected causes and conditions.
In the Abhidhamma Pitaka, the earliest systematic Buddhist philosophy texts, consciousness is analyzed as constantly arising and passing away. What we call a "person" is this flux of consciousness plus the other aggregates (form, sensation, perception, mental formations). An action plants a seed in this stream—it leaves an imprint or disposition (vasana). When conditions mature, that imprint ripens into experience. A person in 2025 experiencing consequences of actions from 2020 involves the same continuity of consciousness, though no unchanging entity persists across that gap.
Karma (literally "action") doesn't require an external judge or a permanent self to experience punishment or reward. It's understood as a natural law of moral causation: actions of a certain quality naturally produce results of a corresponding quality. Generosity conditions the arising of abundance; harmful action conditions suffering. This operates impersonally, like gravity.
The Buddha taught that karma ripens through the causal process itself. In the Samyutta Nikaya, he compares actions to seeds: a bitter seed naturally produces a bitter plant. No judging agent is required; the result flows from the nature of the action within a continuous process. The meditator or practitioner who cultivates wholesome actions today establishes conditions in their stream of consciousness that will bear fruit in experience, precisely because that stream continues unbroken—not because an eternal self "remembers" or "experiences" across time in a substantial way.
Buddhist teachings on rebirth illustrate this mechanism most clearly. When a person dies, no soul transmigrates. Instead, the final moment of consciousness in one life conditions the first moment of consciousness in the next life, like one candle lighting another. The intervening consciousness stream—what we call the next life—unfolds according to karmic conditioning accumulated in previous moments.
Tibetan Buddhism (specifically the Gelug school following Tsongkhapa) explicitly analyzes this: the dying person's consciousness, shaped by their habitual actions and mental state, reaches a subtle level that continues. This isn't a self—it's a causal process. The circumstances of rebirth reflect the person's karma because the arising consciousness naturally meets conditions congruent with its conditioning. Theravada Buddhism, focusing on documented early texts, emphasizes that we can verify karma's operation within a single lifetime without needing to prove rebirth, showing that the causal mechanism functions at every level.
This framework preserves moral responsibility while rejecting a permanent self. You are responsible for your actions because they genuinely condition your future experience through the continuity of your consciousness. You are not responsible to some cosmic judge, nor are you subject to inescapable fate—karma is volitional action, and intention shapes consequences. Each moment offers opportunity to alter conditioning through new choices.
This also explains why Buddhism emphasizes practice and transformation rather than blame. Since you are not a fixed entity, you can become different. The stream of consciousness that experiences consequences is the same stream that can practice meditation, cultivate compassion, and redirect causation. Past actions condition circumstances, but they don't determine an unchangeable destiny—because the process itself, being momentary and conditioned, remains open to change.