What is the difference between unitive mystical experience (Stace, Forman) and numinous experience (Otto), and do they point to the same reality?

Walter Stace (1886-1967) — a British-American philosopher at Princeton — formulated in "Mysticism and Philosophy" (1960) an influential distinction between two types of mystical experience: introvertive and extrovertive unitive mysticism. Robert Forman developed this distinction in "The Problem of Pure Consciousness" (1990). In contrast, Rudolf Otto (1869-1937) — the German theologian — presented in "Das Heilige" (1917) the concept of the "numinous" (das Numinose) as a distinct category of religious experience. The question: do these apparently different experiences point to the same transcendent reality?

Inadequate Responses to Avoid

From some defenders of theism:

"All religious experiences lead to God." Misleading oversimplification. Mystical experiences are radically diverse — some are personal and theistic, others are impersonal, and some completely deny duality. Assuming they are all "paths to God" ignores phenomenological complexity.

"Mystical experience is direct proof of God's existence." Logical leap. Even if we accept that mystical experiences are genuine and meaningful, the transition from "deep subjective experience" to "proof of God's existence" requires additional inferential steps.

From some naturalists:

"Mystical experiences are merely neural hallucinations." Hasty reductionism. Contemporary neuroscientific research (Newberg, Davidson) shows that mystical experiences are associated with distinctive neural patterns, but this does not negate their cognitive content. Just as visual perception has a neural basis without negating the reality of what is seen.

"Mystical experiences are contradictory, therefore all are illusory." Flawed logic. Diversity of experiences does not entail their universal falsity. It may point to the complexity of transcendent reality or the diversity of paths to access it.

Why These Responses Are Inadequate

They fail to engage with the subtle phenomenological distinctions between types of religious experience. The discussion requires detailed analysis of the structure of each type of experience, then assessment of possible relationships between them.

Structure of Unitive Mystical Experience in Stace and Forman

Stace distinguished between two types:

Introvertive Mysticism:
- Complete withdrawal of discriminatory consciousness
- Absence of conceptual and sensory content
- Pure consciousness without object (Pure Consciousness Event in Forman)
- Feeling of absolute unity with being
- Transcendence of time and space
- Sense of unlimited peace and bliss

Extrovertive Mysticism:
- Perception of unity in multiplicity
- Vision of the world as manifestation of the One
- Feeling of cosmic life pulsating in all things
- Preservation of awareness of the external world with transformation in perception

Forman developed the concept of "Pure Consciousness Event" (PCE) as a common core of mystical experiences across cultures. He claims that this experience — despite diverse cultural interpretations — has a unified phenomenological structure: consciousness without content.

Structure of Numinous Experience in Otto

Otto analyzed numinous experience into elements:

Mysterium (Mystery):
- Sense of absolute mystery
- Encounter with what completely transcends human understanding
- "The wholly other" (das ganz Andere)

Tremendum (Awe-inspiring):
- Awe and reverence before absolute power
- Sense of personal smallness and finitude
- Sacred fear distinct from ordinary fear

Fascinans (Fascinating):
- Irresistible attraction toward the sacred
- Love and longing paradoxically combined with awe
- Desire to approach despite fear

Numinous experience — unlike unitive experience — maintains duality between self and sacred. It is an encounter with the divine "Other," not dissolution into it.

Comparison of the Two Structures

Regarding relationship to object:
- Unitive: erasure of subject/object duality
- Numinous: affirmation of duality and encounter

Regarding content:
- Unitive: emptiness of content or pure unity
- Numinous: rich content of holiness and majesty

Regarding emotional response:
- Unitive: peace and bliss
- Numinous: simultaneous awe and attraction

Do They Point to the Same Reality?

Three main positions:

Pluralist Position (Steven Katz, Wayne Proudfoot):
Experiences are radically different because they are culturally constructed. There is no "raw" mystical experience — every experience is shaped by prior expectations and concepts. The Buddhist experience of śūnyatā differs essentially from the Christian experience of union with God.

Perennialist Position (Walter Stace, Aldous Huxley):
Despite apparent diversity, there is a common core. All mystical experiences point to the same absolute reality, but are interpreted through different cultural filters. Differences lie in interpretation, not essence.

Integrative Position (Ninian Smart, John Hick):
Different types of experience reveal different aspects of transcendent reality. Numinous experience reveals the personal aspect of the sacred, unitive experience reveals the impersonal aspect. Both are partially correct.

Assessment from Contemporary Perspective

Neuroscientific research (Andrew Newberg, Eugene Davidson) shows:
- Unitive experiences are associated with decreased activity in the parietal lobe (responsible for self-boundaries)
- Numinous experiences are associated with activation of emotional processing areas and the amygdala

This supports the idea that they are phenomenologically different types, but does not settle the metaphysical question.

Philosophical Challenges

Problem of ineffability: How do we compare experiences whose subjects claim transcend language?

Problem of verification: How do we distinguish between "authentic" and illusory mystical experience?

Problem of cultural diversity: Do cross-cultural similarities point to shared reality or to shared psychological/neural structures?

From the Perspective of Rational Plausibility (rajḥān ʿaqlī)

Mystical and numinous experiences — despite their distinctiveness — may constitute complementary data in cumulative argumentation. Diversity does not negate credibility but may point to the richness of transcendent reality and multiple paths of access to it. A cautious position accepts the potential cognitive value of these experiences without claiming categorical certainty about their ultimate nature.

Where We Stand in This Discussion Today

The discussion has evolved toward:
- More sophisticated neuroscientific studies of mystical states
- More precise phenomenological approaches (microphenomenology)
- Deeper dialogue between contemplative traditions and cognitive science
- Transcending simple dichotomies (cultural/universal, constructivist/essentialist)

Mystical and numinous experiences remain among the richest fields of research in philosophy of religion, intersecting with neuroscience, psychology, and anthropology in fruitful ways.

For Advanced Reading

- Advanced level: Constructivism versus perennialism in mystical experience
- Advanced level: Contemplative neuroscience and consciousness
- W. T. Stace, Mysticism and Philosophy (Macmillan, 1960)
- Robert Forman, The Problem of Pure Consciousness (Oxford UP, 1990)
- Rudolf Otto, The Idea of the Holy (Oxford UP, 1923)
- Steven Katz (ed.), Mysticism and Philosophical Analysis (Oxford UP, 1978)
- Andrew Newberg, Principles of Neurotheology (Ashgate, 2010)
- "Family: Mystical Experience" page on the website