The theory of dharmas
Break experience into its smallest real pieces, the Abhidharma said — and the solid "self" and "world" dissolve into a swarm of flickers.
The "theory of dharmas" is the bold move at the heart of the Abhidharma, the systematizing project that flourished in several early Buddhist schools from around the 3rd century BCE. (Here "dharmas" — Pali dhammas — does not mean the Buddha's teaching, the more common sense of the word, but the smallest factors of existence.) The theory holds that everything we experience can be analyzed down to a finite list of momentary, irreducible factors: particular instances of color, sound, contact, feeling, attention, greed, and so on. These dharmas are treated as the real atoms of experience; the familiar middle-sized things — a person, a chariot, a self — are just convenient labels we paste over swiftly changing bundles of them.
The point was deeply practical. If a meditator can actually see experience this way — as a fast-arising, fast-vanishing stream of impersonal factors — then the felt sense of a solid, permanent "me" running the show loses its grip, which is exactly the insight Buddhism aims at. Analysis here is in service of freedom, not theory for its own sake.
But the theory became contested, and that controversy drove centuries of Buddhist philosophy. A pressing question was whether these ultimate factors possess their own "intrinsic nature" — a real essence that makes each what it is. The realist schools said yes. The later Madhyamaka school turned the Buddha's own logic of dependent origination against them, arguing that even the dharmas are empty of any independent essence. So the theory of dharmas is both a milestone and a foil: a rigorous map of experience that later thinkers prized, refined, and ultimately pushed beyond.
Key passages(20)
Buddhist Dictionary: Manual of Buddhist Terms and Doctrines · Nyanatiloka Mahāthera
The Inquiry of Lokadhara · The Tibetan Kangyur (84000)
太虛大師全書.第六編 法相唯識學(第1卷-第6卷) · The Chinese Buddhist Canon (大藏經)