The Heart

Sri Ramana Maharshi

It is only that Consciousness, which is the Heart of all, not that organ - a small part of the body, which is insentient like a stone, and perishable. So one can achieve the eradication of all desires and control of breath, by the practice of merging the mind in the Heart, which is Pure Consciousness.

Concentrating one's thoughts solely on the Self will lead to happiness or bliss. Drawing in the thoughts, restraining them and preventing them from going outwards is called vairagya. Fixing them in the Self is sadhana or abhyasa (practice). Concentrating on the Heart is the same as concentrating on the Self. The Heart is another name for the Self.