1. VADHAM (ALCHEMY)
2. AITHIYAM (MEDICINE)
3. YOGAM (YOGA)
4. GNANAM or THATHUVAM (PHILOSOPHY)
Siddhars, spiritual scientists of Tamil Nadu explored and explained the reality of Nature and its relationship to man by their yogic awareness
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The eight mighty SIDDHIC PROCESS or OCTOMIRACLE ("ATTA-MA-SIDDHI") which could keep the body strong and perfect for EXTERNAL LIFE, where THERE IS NO DEATH OR REBIRTH.