Hindu Philosophy: The Six Orthodox Schools (Shad Darshana)

In Sanatan Dharma, philosophy is not just an intellectual exercise; it is a practical path to spiritual liberation. The Sanskrit word for philosophy is "Darshana," which literally means "to see" or "a vision of the truth." 

Ancient Indian philosophy is broadly divided into two categories: Astika (Orthodox schools that accept the supreme authority of the Vedas) and Nastika (Heterodox schools like Buddhism and Jainism that do not). 

Within the Astika tradition, there are six major philosophical systems, collectively known as the "Shad Darshana." While they take different approaches—ranging from strict logic to deep meditation—they all share the same ultimate goal: Moksha (liberation from the cycle of birth and death).

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THE SIX SCHOOLS OF PHILOSOPHY (SHAD DARSHANA)

1. Nyaya (The School of Logic)
• Founded by: Sage Gautama
Nyaya is the science of logic and epistemology (how we know what we know). It teaches that human suffering is caused by ignorance and false knowledge. To achieve liberation, one must obtain valid knowledge through four reliable sources: perception (what we see/feel), inference (logical deduction), comparison, and the testimony of reliable experts (like the Vedas). 

2. Vaisheshika (The School of Atomism)
• Founded by: Sage Kanada
Long before modern science, Vaisheshika explored physics and the physical universe. It categorizes all of existence into distinct elements and introduces the concept of "Paramanu" (atoms). It teaches that the entire universe is made up of indestructible atoms, and it is the will of God that causes these atoms to combine and dissolve, creating and destroying the universe.

3. Samkhya (The School of Dualism)
• Founded by: Sage Kapila
Samkhya is one of the oldest philosophies and provides the theoretical foundation for Yoga. It is strictly dualistic, teaching that the universe consists of two independent realities:
- Purusha: Pure, unmanifested consciousness (The Soul).
- Prakriti: Material nature and energy (The Mind and Body).
Samkhya teaches that suffering happens when the eternal soul mistakenly identifies itself with the changing, temporary body and mind. 

4. Yoga (The School of Meditation)
• Founded by: Sage Patanjali
While Samkhya provides the theory, Yoga provides the practical method. Sage Patanjali outlined the "Ashtanga Yoga" (The Eight Limbs of Yoga) in the Yoga Sutras. These eight steps—ranging from moral discipline (Yamas) and physical postures (Asanas) to breath control (Pranayama) and deep meditation (Dhyana)—are designed to completely quiet the mind so the soul can realize its true, divine nature.

5. Mimamsa (The School of Ritual and Duty)
• Founded by: Sage Jaimini
Also known as Purva Mimamsa, this school focuses entirely on the earlier, ritualistic parts of the Vedas (the Karma Kanda). It emphasizes "Dharma" (duty and righteous action). It teaches that by perfectly performing sacred rituals, duties, and sacrifices without selfishness, a person maintains cosmic order and achieves heavenly realms.

6. Vedanta (The School of Ultimate Reality)
• Founded by: Sage Vyasa (Expounded by Adi Shankara, Ramanuja, and Madhvacharya)
Vedanta (meaning "the end of the Vedas") is based on the Upanishads, the Bhagavad Gita, and the Brahma Sutras. It is the most dominant and famous philosophy in modern Hinduism. It focuses on the relationship between the individual soul (Atman) and the supreme, universal reality (Brahman). 

Vedanta itself has three major sub-schools:
- Advaita (Non-Dualism): Taught by Adi Shankara, it states that Atman and Brahman are exactly the same; there is only one reality, and the physical world is an illusion (Maya).
- Vishishtadvaita (Qualified Non-Dualism): Taught by Ramanuja, it states that the soul and God are deeply connected, but God is the whole and souls are parts of Him.
- Dvaita (Dualism): Taught by Madhvacharya, it states that the soul and God are completely separate, and devotion (Bhakti) to God is the only way to salvation.

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THE CORE MESSAGE

Though they may seem to contradict each other at times, ancient sages viewed the Shad Darshana as steps on a ladder. A seeker might start with the logic of Nyaya, discipline their body with Yoga, perform their worldly duties with Mimamsa, and ultimately realize the supreme truth through Vedanta. They are all different paths leading up the exact same mountain.