Karma (, from , ; ) is an ancient Indian concept that refers to an action, work, or deed, and its effect or consequences. In Indian religions, the term more specifically refers to a principle of cause and effect, often descriptively called the principle of karma, wherein individuals' intent and actions (cause) influence their future (effect): Good intent and good deeds contribute to good karma and happier rebirths, while bad intent and bad deeds contribute to bad karma and worse rebirths. In some scriptures, however, there is no link between rebirth and karma.

In Hinduism, karma is traditionally classified into four types: Sanchita karma (accumulated karma from past actions across lifetimes), Prārabdha karma (a portion of Sanchita karma that is currently bearing fruit and determines the circumstances of the present life), Āgāmi karma (future karma generated by present actions), and Kriyamāṇa karma (immediate karma created by current actions, which may yield results in the present or future).

Karma is often misunderstood as fate, destiny, or predetermination. Fate, destiny or predetermination have specific terminology in Sanskrit and are called Prarabdha.

The concept of karma is closely associated with the idea of rebirth in many schools of Indian religions (particularly in Hinduism, Buddhism, Jainism, and Sikhism), as well as Taoism. In these schools, karma in the present affects one's future in the current life as well as the nature and quality of future lives—one's saṃsāra. as metaphysical residue left in the actor). A good action creates good karma, as does good intent. A bad action creates bad karma, as does bad intent. Buddhism and Jainism have their own karma precepts. Thus, karma has not one, but multiple definitions and different meanings. It is a concept whose meaning, importance, and scope varies between the various traditions that originated in India, and various schools in each of these traditions. According to Manu Doshi, all Aryan philosophies accept karma but Jainism has gone deeper into this subject. Wendy O'Flaherty claims that, furthermore, there is an ongoing debate regarding whether karma is a theory, a model, a paradigm, a metaphor, or a metaphysical stance.

In the context of theory, karma is complex and difficult to define. Different schools of Indology derive different definitions for the concept from ancient Indian texts; their definition is some combination of (1) causality that may be ethical or non-ethical; (2) ethicization, i.e., good or bad actions have consequences; and (3) rebirth. Other Indologists include in the definition that which explains the present circumstances of an individual with reference to their actions in the past. These actions may be those in a person's current life, or, in some schools of Indian traditions, possibly actions from their past lives; furthermore, the consequences may result in the current life, or a person's future lives. The law of karma operates independent of any deity or any process of divine judgment.

Causality

upright=0.8|thumb|right|Karma as action and reaction: if we show goodness, we will reap goodnessA common theme to theories of karma is its principle of causality. One of the earliest associations of karma to causality occurs in the Brihadaranyaka Upanishad verses 4.4.5–6:

The theory of karma as causation holds that: (1) executed actions of an individual affects the individual and the life he or she lives, and (2) the intentions of an individual affects the individual and the life he or she lives. Disinterested actions, or unintentional actions do not have the same positive or negative karmic effect, as interested and intentional actions. In Buddhism, for example, actions that are performed, or arise, or originate without any bad intent, such as covetousness, are considered non-existent in karmic impact or neutral in influence to the individual.

Another causality characteristic, shared by karmic theories, is that like deeds lead to like effects. Thus, good karma produces good effect on the actor, while bad karma produces bad effect. This effect may be material, moral, or emotional – that is, one's karma affects both one's happiness and unhappiness.

The consequence or effects of one's karma can be described in two forms: phala and samskara. A phala () is the visible or invisible effect that is typically immediate or within the current life. In contrast, a samskara () is an invisible effect, produced inside the actor because of the karma, transforming the agent and affecting their ability to be happy or unhappy in their current and future lives. The theory of karma is often presented in the context of samskaras.

Karl Potter and Harold Coward suggest that karmic principle can also be understood as a principle of psychology and habit. Karma seeds habits (vāsanā), and habits create the nature of man. Karma also seeds self perception, and perception influences how one experiences life-events. Both habits and self perception affect the course of one's life. Breaking bad habits is not easy: it requires conscious karmic effort. Thus, psyche and habit, according to Potter and Coward, link karma to causality in ancient Indian literature. Wilhelm Halbfass notes that good karma is considered as dharma and leads to punya ('merit'), while bad karma is considered adharma and leads to pāp ('demerit, sin').

Reichenbach (1988) suggests that the theories of karma are an ethical theory.

Rebirth

The third common theme of karma theories is the concept of reincarnation or the cycle of rebirths (saṃsāra). Rebirth, or saṃsāra, is the concept that all life forms go through a cycle of reincarnation, that is, a series of births and rebirths. The rebirths and consequent life may be in different realm, condition, or form. The karma theories suggest that the realm, condition, and form depends on the quality and quantity of karma. In schools that believe in rebirth, every living being's soul transmigrates (recycles) after death, carrying the seeds of Karmic impulses from life just completed, into another life and lifetime of karmas. Yamunacharya (1966) asserts that karma is a fact, while reincarnation is a hypothesis; and Creel (1986) suggests that karma is a basic concept, rebirth is a derivative concept.

The theory of "karma and rebirth" raises numerous questions – such as how, when, and why did the cycle start in the first place, what is the relative Karmic merit of one karma versus another and why, and what evidence is there that rebirth actually happens, among others. Various schools of Hinduism realized these difficulties, debated their own formulations – some reaching what they considered as internally consistent theories – while other schools modified and de-emphasized it; a few schools in Hinduism such as Charvakas (or Lokayata) abandoned the theory of "karma and rebirth" altogether. Schools of Buddhism consider karma-rebirth cycle as integral to their theories of soteriology.

Early development

thumb|upright=1.15|Lotus symbolically represents karma in many Asian traditions. A blooming lotus flower is one of the few flowers that simultaneously carries seeds inside itself while it blooms. Seed is symbolically seen as cause, the flower effect. Lotus is also considered as a reminder that one can grow, share good karma and remain unstained even in muddy circumstances

The Vedic Sanskrit word :wikt:कर्मन्#Sanskrit| (nominative ) means 'work' or 'deed', In the Rigveda, the word occurs some 40 times. In Satapatha Brahmana 1.7.1.5, sacrifice is declared as the "greatest" of works; Satapatha Brahmana 10.1.4.1 associates the potential of becoming immortal (amara) with the karma of the agnicayana sacrifice.

The earliest clear discussion of the karma doctrine is in the Upanishads. Others state that some of the complex ideas of the ancient emerging theory of karma flowed from Vedic thinkers to Buddhist and Jain thinkers. The mutual influences between the traditions is unclear, and likely co-developed.

Many philosophical debates surrounding the concept are shared by the Hindu, Jain, and Buddhist traditions, and the early developments in each tradition incorporated different novel ideas. For example, Buddhists allowed karma transfer from one person to another and sraddha rites, but had difficulty defending the rationale. In contrast, Hindu schools and Jainism would not allow the possibility of karma transfer.

In Hinduism

The concept of karma in Hinduism developed and evolved over centuries. The earliest Upanishads began with the questions about how and why man is born, and what happens after death. As answers to the latter, the early theories in these ancient Sanskrit documents include pancagni vidya (the five fire doctrine), pitryana (the cyclic path of fathers), and devayana (the cycle-transcending, path of the gods). Those who perform superficial rituals and seek material gain, claimed these ancient scholars, travel the way of their fathers and recycle back into another life; those who renounce these, go into the forest and pursue spiritual knowledge, were claimed to climb into the higher path of the gods. It is these who break the cycle and are not reborn. With the composition of the Epics – the common man's introduction to dharma in Hinduism – the ideas of causality and essential elements of the theory of karma were being recited in folk stories. For example:

The 6th chapter of the Anushasana Parva (the Teaching Book), the 13th book of the Mahabharata, opens with Yudhishthira asking Bhishma: "Is the course of a person's life already destined, or can human effort shape one's life?" The future, replies Bhishma, is both a function of current human effort derived from free will and past human actions that set the circumstances. Over and over again, the chapters of Mahabharata recite the key postulates of karma theory. That is: intent and action (karma) has consequences; karma lingers and doesn't disappear; and, all positive or negative experiences in life require effort and intent. For example:

Over time, various schools of Hinduism developed many different definitions of karma, some making karma appear quite deterministic, while others make room for free will and moral agency.

  • The Vaisesika school does not consider the karma from past lives doctrine very important.
  • The Samkhya school considers karma to be of secondary importance (second to prakrti).
  • The Mimamsa school gives a negligible role to karma from past lives, disregards samsara and moksa.
  • The Yoga school considers karma from past lives to be secondary, one's behavior and psychology in the current life is what has consequences and leads to entanglements.

The above schools illustrate the diversity of views, but are not exhaustive. Each school has sub-schools in Hinduism, such as that of non-dualism and dualism under Vedanta. Furthermore, there are other schools of Indian philosophy, such as Charvaka (or Lokayata; the materialists), that denied the theory of karma-rebirth, as well as the existence of God; to this non-Vedic school, the properties of things come from the nature of things. Causality emerges from the interaction, actions, and nature of things and people, making determinative principles such as karma or God unnecessary.

In Buddhism

Karma and karmaphala are fundamental concepts in Buddhism, which explain how our intentional actions keep us tied to rebirth in samsara, whereas the Buddhist path, as exemplified in the Noble Eightfold Path, shows us the way out of samsara.

The cycle of rebirth is determined by karma, literally 'action'. Karmaphala (wherein phala means 'fruit, result') refers to the 'effect' or 'result' of karma. The similar term karmavipaka (wherein vipāka means 'ripening') refers to the 'maturation, ripening' of karma.

In the Buddhist tradition, karma refers to actions driven by intention (cetanā), a deed done deliberately through body, speech or mind, which leads to future consequences. The Nibbedhika Sutta, Anguttara Nikaya 6.63:

How these intentional actions lead to rebirth, and how the idea of rebirth is to be reconciled with the doctrines of impermanence and no-self, is a matter of philosophical inquiry in the Buddhist traditions, for which several solutions have been proposed. In early Buddhism, no explicit theory of rebirth and karma is worked out, and "the karma doctrine may have been incidental to early Buddhist soteriology." In early Buddhism, rebirth is ascribed to craving or ignorance.

Unlike that of Jains, Buddha's teaching of karma is not strictly deterministic, but incorporated circumstantial factors such as other Niyamas. subjects that are beyond all conceptualization, and cannot be understood with logical thought or reason.