What is Three Marks of Existence?
The Three Marks of Existence (tilakkhaṇa in Pāli, trilakṣaṇa in Sanskrit) are Buddhism's three-part analysis of all conditioned phenomena. The three are: impermanence ([anicca](lexicon:anicca)), unsatisfactoriness ([dukkha](lexicon:dukkha)), and no-self ([anattā](lexicon:anatta)). The tradition treats these not as beliefs to hold but as insights to recognise directly, and vipassanā practice is designed to bring that recognition about in lived experience.
Three marks, Four Noble Truths, and the skandhas
The Three Marks and the Four Noble Truths overlap but are not the same thing. The Four Noble Truths are a diagnosis: suffering exists, it has a cause, cessation is possible, and there is a path. The Three Marks are what that diagnosis rests on, observations about the nature of conditioned existence that explain why the First Noble Truth holds. The skandhas are a related but separate analysis: they describe what a person is made of, while the Three Marks describe how everything behaves, including each skandha. The Three Marks also differ from emptiness (śūnyatā) as taught in Mahāyāna: emptiness is the Mahāyāna extension of anattā, widening no-self from persons to all phenomena, including elements the Theravāda Abhidhamma still treats as discrete dhammas.
The three
The Pāli text gives the list in three compact formulations. Sabbe saṅkhārā aniccā: all conditioned things are impermanent. Sabbe saṅkhārā dukkhā: all conditioned things are unsatisfactory. Sabbe dhammā anattā: all phenomena, conditioned or not, are without self. The first two formulations are claims about the field of changing experience. The third is broader: anattā applies to dhammas, the basic constituents of experience itself, including the unconditioned nirvāṇa the path leads toward. The shift in scope from the second mark to the third is deliberate. Absence of self is not a feature only of the impermanent realm one is trying to move beyond. It characterises every phenomenon, including the destination. Each term carries its own lexicon entry: anicca, dukkha, anattā. Translations vary enough across English translators that pinning the vocabulary down at first use is part of the work.
How they function in practice
The list is doctrinal in form but practical in function. The classical Theravāda curriculum presents the marks as the three things insight is engineered to surface, roughly in that order, over long retreat practice. Anicca is what attention notices first: the relentless arising and passing of every sensory event, once noting becomes fine-grained enough that the impression of stable objects starts to dissolve. Dukkha is the second recognition: the mind, having noticed impermanence, continues to grasp anyway, and the gap between what it grasps for and what is there to grasp is the structural source of its unease. Anattā is the third: the noticing-mind itself does not have the kind of inside the previous two recognitions assumed it had. The classical vipassanā progression deepens these three across the ñāṇa stages mapped in Buddhaghosa's fifth-century [Visuddhimagga](lexicon:visuddhimagga), which remains the most detailed manual of how the recognitions are supposed to land in lived experience.
Across the three vehicles
Theravāda treats the three marks as the explicit content of insight, named in classical Pāli at every stage of the path. Mahāyāna extends anattā outward into emptiness (śūnyatā): the doctrine that nothing whatsoever, including the elements of experience the Theravāda Abhidhamma treats as discrete dhammas, has independent existence. The Madhyamaka school formalises this extension, and the interbeing vocabulary Thich Nhat Hanh brings into modern English is the same recognition in contemporary dress. Vajrayāna takes the three marks and extended śūnyatā further: the practitioner's own awareness, once recognised in the Buddha-nature idiom, is the unbroken ground every conditioned phenomenon arises in. These are not three competing doctrines. They are three depths at which the same recognition is presented, with anattā present in all three and the technical content widening as the framework widens.
In the index
The clearest sustained presentation of the three marks in the index is Tara Brach and Jack Kornfield's Power of Awareness. Its IMS-Theravāda curriculum walks the practitioner through the anicca / dukkha / anattā progression in unornamented English over a multi-week retreat-style sequence. Jon Kabat-Zinn's MBSR carries the same content in clinical idiom: the body scan and noting practice the eight-week programme prescribes are vipassanā stripped of the Pāli vocabulary, and the impermanence and unsatisfactoriness recognitions emerge in practitioners on the same timetable the older curriculum predicts. On the Mahāyāna side, Thich Nhat Hanh on emptiness, signlessness and aimlessness is the index's most direct exposition of the three marks once they are widened into the emptiness framework. The Plum Village teaching carries the same content in pastoral register. Pema Chödrön's *When Things Fall Apart* and her course on awakening compassion sit on the Tibetan side: the books read the three marks through the lens of groundlessness, the Karma Kagyu rendering of anattā as the experiential ground from which compassionate action arises. Adyashanti's *Do Nothing* approaches the same recognition from the Zen side, where anattā is the seeing-into-one's-own-nature that the koan curriculum is engineered to provoke.
