Karma
Early development

The Vedic Sanskrit word kárman- (nominative kárma) means 'work' or 'deed', often used in the context of Srauta rituals. 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.

In the early Vedic literature, the concept of karma is also present beyond the realm of rituals or sacrifices. The Vedic language includes terms for sins and vices such as āgas, agha, enas, pāpa/pāpman, duṣkṛta, as well as for virtues and merit like sukṛta and puṇya, along with the neutral term karman.

Whatever good deed man does that is inside the Vedi; and whatever evil he does that is outside the Vedi.

The verse refers to the evaluation of virtuous and sinful actions in the afterlife. Regardless of their application in rituals (whether within or outside the Vedi), the concepts of good and evil here broadly represent merits and sins.

What evil is done here by man, that it (i.e. speech = Brahman) makes manifest. Although he thinks that he does it secretly, as it were, still it makes it manifest. Verily, therefore one should not commit evil.

This is the eternal greatness of the Brahmin. He does not increase by kárman, nor does he become less. His ātman knows the path. Knowing him (the ātman) one is not polluted by evil karman.

The Vedic words for "action" and "merit" in pre-Upaniṣadic texts carry moral significance and are not solely linked to ritual practices. The word karman simply means "action," which can be either positive or negative, and is not always associated with religious ceremonies; its predominant association with ritual in the Brāhmaṇa texts is likely a reflection of their ritualistic nature. In the same vein, sukṛta (and subsequently, puṇya) denotes any form of "merit," whether it be ethical or ritualistic. In contrast, terms such as pāpa and duṣkṛta consistently represent morally wrong actions.

The earliest clear discussion of the karma doctrine is in the Upanishads. The doctrine occurs here in the context of a discussion of the fate of the individual after death. For example, causality and ethicization is stated in Bṛhadāraṇyaka Upaniṣad 3.2.13:

Truly, one becomes good through good deeds, and evil through evil deeds.

Some authors state that the samsara (transmigration) and karma doctrine may be non-Vedic, and the ideas may have developed in the " shramana " traditions that preceded Buddhism and Jainism. 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.
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