Karma (Sanskrit, also karman, Pāli: kamma) is a Sanskrit term that literally means "action" or "doing". In the Buddhist tradition, karma refers to action driven by intention (cetanā) which leads to future consequences. Those intentions are considered to be the determining factor in the kind of rebirth in samsara, the cycle of rebirth. Karma leads to future consequences, karma-phala, "fruit of action". Any given action may cause all sorts of results, but the karmic results are only those results which are a consequence of both the moral quality of the action, and of the intention behind the action. The basic idea is that intentional actions, driven by kleshas ("disturbing emotions"), cetanā ("volition"), or taṇhā ("thirst", "craving"), create impressions, tendencies or "seeds" in the mind. These impressions, or "seeds", will ripen into a future result or fruition. If we can overcome our kleshas, then we break the chain of causal effects that leads to rebirth in the six realms.
The Buddha's teaching of karma is not strictly deterministic, but incorporated circumstantial factors, unlike that of the Jains. It is not a rigid and mechanical process, but a flexible, fluid and dynamic process, and not all present conditions can be ascribed to karma. There is no set linear relationship between a particular action and its results. The karmic effect of a deed is not determined solely by the deed itself, but also by the nature of the person who commits the deed, and by the circumstances in which it is committed.
Karma is also not the same as "fate" or "predestination". Karmic results are not a "judgement" imposed by a God or other all-powerful being, but rather the results of a natural process. Certain experiences in life are the results of previous actions, but our responses to those experiences are not predetermined, although they bear their own fruit in the future. Unjust behaviour may lead to unfavorable circumstances which make it easier to commit more unjust behavior, but nevertheless the freedom not to commit unjust behavior remains.
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