Mysticism Across Traditions

Mysticism — the pursuit and experience of direct union or contact with ultimate reality — is found in every major tradition: Christian (Eckhart, John of the Cross, Teresa of Ávila), Jewish (Kabbalah, the Merkabah and Ein Sof), Islamic (Sufism — Rumi, Ibn 'Arabi, al-Ghazālī), Hindu (the Upaniṣads, Advaita), Buddhist (the experience of śūnyatā, satori), and Daoist (union with the Dao). Its comparative study raises a sharp philosophical question that recurs throughout these notes: are the mystics of different traditions having the same experience differently described, or different experiences shaped by their differing beliefs? The answer bears on the argument from religious experience, on religious pluralism, and on the limits of religious language.

This page gives a comparative overview, revisits the perennialism vs. constructivism debate in its cross-traditional form, and treats ineffability and the limits of language. (The epistemology of mystical experience — its reliability as a source of belief — is developed under religious experience; this page is comparative and concerns its nature and describability.)

The comparative phenomenon

Across traditions, mystical literature shows recurrent family resemblances — which is what makes "mysticism" a useful cross-cultural category and tempts the perennialist reading:

• Union or identity with the ultimate. The Christian "union with God" and "deification" (theosis); the Sufi fanā' (annihilation of the self in God) and baqā' (subsistence in God); the Advaitin realisation Tat tvam asi ("That thou art" — identity of Ātman and Brahman); the Daoist merging with the Dao.
• Loss or transformation of the self. A dissolution of the ordinary ego-boundary, reaching its most radical form in the Buddhist realisation of no-self (anattā) and emptiness.
• Ineffability and paradox. A near-universal insistence that the experience cannot be captured in words and that ordinary concepts break down (below).
• Noetic certainty and transformation. The conviction that one has grasped the truth (James's "noetic quality"), and a consequent moral and spiritual transformation (which Hick makes the test of authenticity).

But the descriptions diverge sharply at the crucial point: a personal God met in love (theistic mysticism) versus an impersonal absolute (Brahman, the Dao) versus a self-emptying emptiness with no God or self at all (Buddhism). The whole debate is whether these divergences are interpretive overlays on a common core or constitutive of different experiences.

Perennialism vs. constructivism (revisited)

The comparative material is exactly the battleground of the perennialism/constructivism dispute introduced in the epistemology section; viewed across traditions it takes its sharpest form:

• Perennialism (Aldous Huxley's "perennial philosophy," W.T. Stace, the Traditionalists): beneath the diverse theologies lies one universal mystical experience — typically the introvertive experience of pure, undifferentiated unity — which mystics then clothe in the doctrines of their tradition. Huxley: a single "Highest Common Factor" underlies all the great mysticisms. On this view the Christian, the Sufi, the Advaitin, and the Zen master touch the same reality; the conflict is in the words, not the experience. Perennialism underwrites Hick's pluralism (all are responses to one Real) and strengthens the argument from experience (a convergent core would be powerful evidence).
• Constructivism (Steven Katz: "there are NO pure, i.e. unmediated, experiences"): the mystic's tradition, concepts, expectations, and training shape the experience itself, not merely its description. A Jewish mystic, formed by a personal, covenantal God and a tradition that forbids claims of identity-with-God, has a devekut (cleaving, but never merging) experience that constitutively differs from the Advaitin's identity with Brahman or the Buddhist's emptiness. The very diversity of reports is evidence that the experiences differ, because experience is always conceptually mediated. Constructivism explains the divergence but lowers the evidential value of mysticism (if experience mirrors prior belief, it cannot independently confirm it).

Moderate positions (Robert Forman's "Pure Consciousness Event," William Wainwright, Ninian Smart): perhaps the introvertive, contentless states (pure consciousness, empty of all objects) are minimally mediated and so cross-culturally similar — vindicating a limited perennialism — while the theistic, visionary, and unitive-with-an-object experiences are heavily constructed. On this view mysticism is not monolithic: some types are more tradition-neutral than others, and the perennialist and constructivist are each partly right about different kinds of mystical state.

Ineffability and the limits of language

The most consistent claim of mystics everywhere is that the experience is ineffable — beyond the reach of language and concept. "The Dao that can be spoken is not the eternal Dao"; the Advaitin's Brahman is neti neti ("not this, not this"); Eckhart's Godhead beyond "God"; the Sufi's annihilation beyond description. This generates the paradox of ineffability: to say "it is ineffable" is to say something, and the mystics in fact write volumes. Resolutions (developed under religious language):

• Ineffability concerns adequate, literal, propositional description: the experience can be pointed at — by negation, paradox, metaphor, poetry — but not captured in determinate concepts. Hence the mystics' characteristic recourse to the via negativa (saying only what the ultimate is not), to paradox ("dazzling darkness," "the sound of one hand"), and to symbol and poetry (Rumi, John of the Cross).
• Ineffability marks the breakdown of the subject–object structure that ordinary language presupposes: in undifferentiated unity (or in no-self) there is no "object" set over against a "subject" to be predicated of, so the declarative form that language requires has nothing to latch onto.

This makes mysticism the experiential root of the apophatic theology of every tradition — Pseudo-Dionysius, Maimonides, the Sufis, the Daoists, the Advaitins all converge on the inadequacy of positive God-talk — and a central datum for the philosophy of religious language: if the highest religious knowledge is ineffable, then religious language is at best gesture, and the verificationist demand for cognitive content is doubly hard to meet.

Where mysticism sits

Mysticism is the experiential core of the traditions and the most direct putative contact with the ultimate, and its comparative study sharpens three of the field's central questions to a point. The perennialism/constructivism debate decides whether the world's mystics — Christian, Sufi, Kabbalist, Advaitin, Buddhist, Daoist — touch one reality variously described (vindicating Hick's pluralism and strengthening the argument from experience) or have different experiences manufactured by their traditions (explaining the diversity but draining the evidential force), with the moderate view that contentless states are more uniform than theistic ones. The near-universal claim of ineffability makes mysticism the root of the apophatic / via negativa tradition across all the faiths and a hard case for the philosophy of religious language. And the mystics' recurrent dissolution of the self — radicalised in Buddhist no-self — connects to both the afterlife and the free-will discussions of personal identity. Mysticism thus binds together the comparative, epistemological, linguistic, and pluralist threads of the whole field.