TREE OF TRUTH
⬡  Thinker Leaves

Sages & Scientists

The historical and living minds whose inquiries form the leaves of the Tree of Truth — from ancient sages to frontier researchers converging on the same ground.

Pre-900 CE · Foundational Sages

Ancient & Classical

c. 3000 BCE — IndiaDivine Source

Krishna

ROOTSBRANCHES

How can one act fully in the world while remaining untouched by the fruits of action?

Divine teacher of the Bhagavad Gita. Revealed to Arjuna the eternal nature of the Self, the three paths of Yoga (Karma, Jnana, Bhakti), and the non-dual truth that all of existence is one divine reality.

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c. 4 BCE – 30 CE — PalestineMystical Source

Jesus of Nazareth

ROOTSBRANCHES

What does the Kingdom of Heaven within reveal about the unity of the individual soul and its divine source?

Taught that the Kingdom of Heaven is a present interior reality. 'I and the Father are one' and 'Before Abraham was, I Am' point to a non-dual unity of the finite self and the infinite ground.

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c. 788–820 CE — IndiaAdvaita Vedanta

Adi Shankaracharya

ROOTSBRANCHES

Is the individual self ultimately different from the ground of being — or is the sense of separation the only illusion?

Systematized Advaita Vedanta. Introduced adhyasa (superimposition) to explain how the infinite mistakenly identifies with the finite. Brahman alone is real; the world is appearance.

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c. 5th–4th century BCE — IndiaBuddhist Inquiry

Gautama Buddha

ROOTSBRANCHES

What causes suffering — and can awareness itself be liberated from it?

Articulated the anatta (no-self) teaching: the five aggregates are not a self. Taught mindfulness and the Noble Eightfold Path as the systematic dissolution of suffering through direct investigation.

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c. 2nd century CE — IndiaMadhyamaka

Nagarjuna

ROOTSBRANCHES

Does anything — including consciousness, including emptiness itself — have inherent existence?

Formulated Madhyamaka philosophy. Proved logically that all phenomena are empty (śūnyatā) of independent, inherent existence — arising only in dependent co-origination. The Middle Way between existence and non-existence.

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c. 2nd century BCE–4th century CE — IndiaClassical Yoga

Patanjali

ROOTSBRANCHES

How does the movement of the mind obscure the nature of pure consciousness — and how can it be stilled?

Systematized the Yoga Sutras: the foundational psychology of consciousness. Distinguished purusha (pure consciousness) from prakriti (matter/mind); defined yoga as stilling the fluctuations of the mind-field.

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c. 6th century BCE — ChinaTaoism

Lao Tzu

ROOTSBRANCHES

How can one live in effortless alignment with the flow of the universe (Tao) before the thinking mind creates division?

Authored the Tao Te Ching, establishing Taoism. Taught that the Tao (the Way) is the source and substance of all things, ineffable and nameless. Introduced Wu Wei (effortless action) and the deconstruction of the conceptual self in favor of natural harmony.

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1800–1950 · Transmission & Synthesis

Classical Era

1836–1886 — IndiaMystic Union

Ramakrishna Paramahamsa

ROOTSBRANCHES

Are all genuine spiritual paths — across traditions — pointing at the same undivided reality?

Demonstrated phenomenologically that different spiritual paths lead to the same non-dual realization. Practiced Vedanta, Islam, and Christianity in succession, reaching samadhi in each.

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1863–1902 — India / InternationalModern Vedanta

Swami Vivekananda

ROOTSBRANCHES

How can the depth of Vedantic non-dualism speak to the modern, scientific, and Western mind?

Introduced Vedanta and Yoga to the West as an empirical science of mind — not dogma. Formulated the four paths (Karma, Jnana, Bhakti, Raja Yoga) to suit different human temperaments.

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1842–1910 — USAEmpirical Mysticism

William James

ROOTSBRANCHES

Are mystical states mere subjective distortions — or genuine noetic revelations about the nature of consciousness?

Father of American psychology. His Varieties of Religious Experience was the first systematic, empirical study of mystical states. Established four marks of mystical experience and coined 'stream of consciousness'.

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1872–1950 — India / InternationalIntegral Philosophy

Sri Aurobindo

ROOTSBRANCHES

If consciousness is the ground of reality, can matter itself be transformed into a vehicle of that consciousness?

Developed Integral Yoga: consciousness is not merely to be transcended but to actively transform matter. Proposed the Supramental as the next emergent level of evolution beyond ordinary mind.

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1879–1950 — IndiaSelf-Inquiry

Ramana Maharshi

ROOTSBRANCHES

Who am I?

Pioneered atma vichara (self-inquiry). Following a spontaneous death-recognition at 16, he taught seekers to trace the 'I-thought' back to its silent source — discovering awareness as the foundational ground.

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1897–1981 — IndiaI Am That

Nisargadatta Maharaj

ROOTSBRANCHES

What are you before you think you are something?

Taught the most uncompromising non-duality. Pointed to the bare 'I Am' — the sense of being prior to all concepts — as the last doorway to the Absolute.

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1910–1997 — IndiaDirect Path

H.W.L. Poonja (Papaji)

ROOTSBRANCHES

Who is the one seeking liberation — and what remains when the seeker is seen through?

Direct disciple of Ramana Maharshi. Taught that liberation is always already the case — not a future achievement. 'Keep Quiet' was his primary pointer: the natural stillness prior to thought.

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1895–1986 — India / InternationalPathless Path

Jiddu Krishnamurti

ROOTSBRANCHES

Can the human mind empty itself of all memory, conditioning, and authority to discover the unconditioned?

Maintained that truth is a pathless land. Rejected all gurus, belief systems, and psychological authority. Highlighted that the observer is the observed, and that psychological time is the source of all human conflict.

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1915–1973 — UK / USAWestern Zen

Alan Watts

ROOTSBRANCHES

What if the feeling of being a separate ego 'shrink-wrapped' in a bag of skin is a cultural hallucination?

Interpreted Zen Buddhism, Taoism, and Vedanta for the West. Popularized the idea that the individual is not an isolated stranger in the universe, but an expression of the entire cosmic energy patterns.

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1941–Present · Researchers & Philosophers

Modern Science & Philosophy

1941– — Italy / USAQuantum Mind

Federico Faggin

ROOTSBRANCHES

Can consciousness — with its qualia, free will, and meaning — be reduced to computation?

Inventor of the microprocessor. Concluded that consciousness cannot arise from computation — qualia and meaning are irreducibly non-computational. Proposed a quantum model for fundamental awareness.

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1946– — India / USAIntegrative Bridge

Deepak Chopra

ROOTSBRANCHES

How do consciousness, healing, and the nature of reality intersect?

Prominent bridge bringing mind-body medicine and non-dual Vedantic philosophy into mainstream Western culture, collaborating with scientists to ground these concepts in contemporary frameworks.

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1958– — GermanyPSM Theory

Thomas Metzinger

ROOTSBRANCHES

What is the self — and what happens when the brain's model of the self breaks down?

Developed the Phenomenal Self-Model (PSM): selves do not exist in the world — there are only transparent mental models of the self generated by the brain, arriving at the Buddhist no-self through purely scientific means.

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1955– — USAConscious Agents

Donald Hoffman

ROOTSBRANCHES

Is the world we perceive the world as it actually is — or a user interface shaped by fitness?

Applied evolutionary game theory to prove that our perception is a species-specific interface hiding objective reality. Hypothesizes that reality is a network of interacting conscious agents — not physical objects.

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1966– — Australia / USAHard Problem

David Chalmers

ROOTSBRANCHES

Why is there something it is like to have an experience?

Formulated the 'Hard Problem of Consciousness'. Demonstrated that explaining cognitive functions is entirely distinct from explaining subjective feel — legitimizing consciousness as an irreducible fundamental parameter.

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1973– — NetherlandsAnalytical Idealism

Bernardo Kastrup

ROOTSBRANCHES

Why is idealism — consciousness as the ground of all existence — the most parsimonious account of reality?

Rehabilitated Analytical Idealism. Reality is a singular cosmic mind; individual minds are dissociated alters of that cosmic consciousness — the same position as Advaita Vedanta, arrived at by different routes.

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1978– — UKPanpsychism

Philip Goff

ROOTSBRANCHES

What if consciousness was never something to be explained by physics — but something physics was always built on top of?

Argued that Galileo's exclusion of qualities from physics created the Hard Problem. Advocates panpsychism: consciousness is the intrinsic nature of matter, present at all levels of reality.

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1956– — Germany / USANeuroscience

Christof Koch

ROOTSBRANCHES

What are the neural correlates of consciousness — and what do decades of searching for them reveal?

Spent decades mapping the brain structures necessary for conscious states with Francis Crick. Followed empirical evidence away from strict reductionism toward Integrated Information Theory and scientific panpsychism.

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1917–1992 — USA / UKQuantum Whole

David Bohm

ROOTSBRANCHES

Does quantum physics reveal an undivided, flowing wholeness in which matter and consciousness are folded into each other?

Proposed the Implicate and Explicate Order. Argued that space-time and physical particles are a surface appearance (explicate order) emerging from an underlying, undivided wholeness (implicate order). Conducted historic dialogues with J. Krishnamurti exploring the nature of thought as a material process.

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1985– — India / USAPsychiatry

Dr. Alok Kanojia

ROOTSBRANCHES

How can psychiatry, neuroscience, and contemplative practices be integrated to heal modern mental health crises?

Psychiatrist and founder of HealthyGamer. Integrates neuroscience, modern psychiatry, and contemplative psychology into actionable clinical tools to treat digital addiction and identity crisis.

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1944–Present · Contemporary Integrators

Living Teachers