The ideal of Absolute Monism (Absolute Oneness) or Advaita (Non-Duality) is purely subjective. It is not historical doctrine or external creed but true realization. It is at the heart of all beings and is experienced rather than expressed. Self-realization comes with an understanding of duality and the ability to see beyond it. This Yoga requires Self-knowlege and Self-mastery in pursuit of Self-liberation.