World Religions › The Axial Age › Hinduism
Karma and rebirth (samsara)
First taught in early Upanishads, c. 700 BC· Belief or practice· Hindu, Buddhist, Jain & Sikh
Mostly agreed by scholarsMost historians agree; some details uncertain.
The belief that every action has moral consequences (karma) carried into an endless cycle of death and rebirth (samsara).
See it on the World Religions map →What it is
Karma means 'action'. Hindu, Buddhist, Jain and Sikh teaching holds that good and bad deeds shape a person's next life, whether as human, animal, god or being in hell. The cycle, samsara ('wandering'), has no fixed beginning and is seen as ultimately unsatisfying. Traditions differ on what is reborn: Hindus speak of an eternal self (atman), Buddhists deny any permanent self, and Jains picture karma as fine matter clinging to the soul.
Why it matters
It underlies the moral outlook of over 1.5 billion Hindus, Buddhists, Sikhs and Jains, and frames their ultimate goal as escape from rebirth, not reward in heaven.
Think of it like
Like a tenant's rental history: past conduct follows you and shapes what you are offered at the next address.
Sources and history
First set out in the Brihadaranyaka and Chandogya Upanishads, c. 700–600 BC; elaborated in Buddhist and Jain canons. A 2018 Pew survey found about a third of Americans believe in reincarnation.
Questions and debates
Where the idea came from is debated: Vedic priests, wandering ascetics of the Ganges plain, or earlier non-Vedic peoples.
Connections (5)
▸Karma and rebirth (samsara) is the rebirth model among Afterlife beliefs across faithsMostly agreed by scholars
The connection
Most afterlife beliefs picture one destination after one life: an underworld, heaven or hell. Karma and rebirth offers a different model: many lives in sequence, each person's deeds deciding the next birth, and final liberation, not heavenly reward, as the ultimate goal.
When and where
Ganges plain of northern India, c. 700–500 BC, in the early Upanishads, then Buddhist and Jain teaching; spread across Asia with Buddhism.
How do we know?
The texts show the shift: earlier Vedic hymns speak of the dead joining the ancestors in a heavenly world; the Upanishads introduce repeated birth and death.
Questions and debates
Whether rebirth ideas in ancient Greece, held by Pythagoras and Plato, arose independently or through contact with India is unresolved.
▸Jainism shares belief in Karma and rebirth (samsara)Mostly agreed by scholars
The connection
Jains share the Indian belief in karma and rebirth but give it a physical form: karma is fine, sticky matter that clings to the soul through actions, especially harmful ones, and weighs it down into new births. Strict nonviolence and fasting block new karma and burn off old, freeing the soul.
When and where
The Ganges plain, c. 6th–5th century BC, the same setting as the Buddha and the later Upanishads; systematized in the Tattvartha Sutra (c. AD 200–450).
How do we know?
Jain scriptures and the Tattvartha Sutra describe karma in detail; early Buddhist texts criticize Jain views, confirming they were already current.
Questions and debates
Whether Jains or Upanishadic thinkers developed karma theory first, or both drew on a shared culture of wandering ascetics, is debated.
▸Upanishads first teach Karma and rebirth (samsara)Mostly agreed by scholars
The connection
The earliest Upanishads are the first texts to state clearly that people are reborn according to their deeds. The Brihadaranyaka says 'as a man acts, so he becomes': good action makes one good, bad action bad. The Chandogya speaks of rebirth into pleasant or lowly wombs.
When and where
Northern India, c. 700–500 BC; the Brihadaranyaka and Chandogya Upanishads, linked to teachers like Yajnavalkya and King Pravahana Jaivali.
How do we know?
Earlier Vedic hymns lack the full doctrine; the Chandogya even presents it as new knowledge a king teaches a Brahmin, unknown to priests before.
Questions and debates
That royal-teacher framing suggests the idea may have come from outside priestly circles; its real origins are debated.
▸Karma and rebirth (samsara) underpins HinduismMostly agreed by scholars
The connection
Hindu teaching holds that every action has consequences that shape future lives, and that the soul (atman) is reborn again and again in samsara, the cycle of birth and death. This frames Hindu ethics, ritual and the goal of moksha, release from the cycle; it was also long used to explain caste birth as the fruit of past deeds.
When and where
First appears in the Brihadaranyaka and Chandogya Upanishads, about 700–600 BC, and assumed by the epics, the Puranas and the Bhagavad Gita.
How do we know?
The doctrine is absent from the earlier Rigveda and appears in the Upanishads, which lets scholars date its arrival; nearly all later Hindu texts presuppose it.
Questions and debates
Whether rebirth came from Vedic priests, from non-Vedic renouncers of the Ganges plain, or even from older Indus-era beliefs is debated.
▸Moksha: liberation, and Brahman–Atman is release from Karma and rebirth (samsara)Mostly agreed by scholars
The connection
If karma keeps the self cycling through birth after birth, moksha is the exit. Good karma only buys a better rebirth, even as a god; liberation ends the cycle entirely. Teachers disagree on the route, whether knowledge, devotion or selfless action, but agree on the goal.
When and where
India from the Upanishads, about 700 BC; developed in the Bhagavad Gita (c. 200 BC–AD 200), which teaches action without attachment to results.
How do we know?
Hindu scripture from the Upanishads to the Gita states it, and the idea is paralleled in Buddhist nirvana and Jain liberation.
Questions and debates
Whether liberation can be reached within this life (jivanmukti) or only at death is debated among Hindu schools.