Action, its unfailing fruit, and the wheel of birth and rebirth — the moral physics of the universe and the problem to which moksha is the answer.
Karma: Literally "action" — and, by extension, the seed-result every action leaves behind
Samsara: The cycle of birth, death and rebirth driven by karma and desire
Three kinds of karma: Sanchita (stored), prārabdha (already ripening in this life), āgāmi/kriyamāṇa (now being made)
The escape: Moksha — liberation from the cycle, the fourth purushartha
Key text: Bhagavad Gita on niṣkāma karma — acting without claim on the fruit
Karma: Action and Its Fruit
Karma simply means action — but the tradition's insight is that no action ends when it ends. Every deed, word and sustained thought leaves a residue, a seed (karma-phala, the fruit of action) that will ripen into experience — in this life or another — as surely as a planted seed becomes a tree. This is not reward and punishment handed down by a judging god; it is described as a law of nature, moral cause-and-effect as impartial as gravity. The Brihadaranyaka Upanishad states it early and plainly: as one acts, so one becomes — the doer of good becomes good, the doer of evil becomes evil. Karma is therefore the opposite of fatalism: it says your present is shaped by past action and your future is being shaped right now, by you. Nothing is owed to luck, and nothing is wasted.
Samsara: The Wheel of Becoming
Because karmic seeds outlast a single body, the self (atman) travels — leaving a worn body at death and taking a new one, as the Gita says, the way a person changes worn-out clothes. This ongoing journey through birth, death and rebirth is samsara, the wheel of becoming. What keeps it turning is not karma alone but the desire and self-ignorance behind action: acting to grasp and to avoid, we bind ourselves to results, and results require future births to be experienced. The tradition sorts a soul's accumulated karma into three heaps: sanchita, the whole stored inventory; prārabdha, the portion already ripening that shaped this birth — body, family, circumstances — and must play out; and āgāmi, the fresh karma being generated now. Prārabdha explains why saints still fall ill and the wicked sometimes prosper: this life's conditions were sown earlier. What remains fully in our hands is the karma we are making today.
Acting Without Bondage
If action binds, is the solution to stop acting? The Gita's answer is a firm no — total inaction is impossible, and shirking duty is itself an act. The real bond is not action but attachment to its fruit. Krishna's teaching of niṣkāma karma — desireless action — is to do one's duty with full effort while surrendering the claim on results: "karmaṇy evādhikāras te mā phaleṣu kadācana" — your right is to the action alone, never to its fruits. Acted this way, work stops planting seeds; performed as an offering (karma yoga), it actually purifies. This converts the doctrine of karma from a ledger of debts into a spiritual path: the same daily life that binds one person liberates another, depending entirely on the spirit in which it is done. The wheel of samsara, in the end, is not escaped by dying — only by acting, and loving, without grasping.
Questions
Is karma fate?
No — it is closer to the opposite. Fate says your future is fixed regardless of what you do; karma says your future is built from what you do. The circumstances of this life (prārabdha) are given, like the hand dealt in a game, but how the hand is played — the karma being made now — is free, and it shapes everything that follows.
Why don't we remember past lives?
The tradition holds that memory belongs to the brain, which is new with each body, while the deep tendencies (samskaras and vasanas) carried by the subtle self persist — visible as inborn temperament, talents and fears. Forgetting is even seen as a mercy: each life is a fresh examination, not an eternal re-reading of old ones.
Source: Upanishads, Bhagavad Gita, Yoga Sutras — presented as an educational overview of classical teaching. Regional versions may vary — this text follows the version most widely used in community worship.