The seat of Realization is within and the seeker cannot find it as an object outside him. That seat is bliss and is the core of all beings. Hence it is called the Heart.
Ramana MaharshiThe Self is the heart, self-luminous. Illumination arises from the heart and reaches the brain, which is the seat of the mind. The world is seen with the mind; so you see the world by the reflected light of the Self.
Ramana Maharshi