Concentration is not thinking of one thing. On the contrary, it is excluding all thoughts, since all thoughts obstruct the sense of one's true being. All efforts are to be directed simply to removing the veil of ignorance. Concentrating the mind solely on the Self will lead to happiness or bliss. Drawing in the thoughts, restraining them and preventing them from straying outwards is called detachment (vairagya). Fixing them in the Self is spiritual practice (sadhana). Concentrating on the heart is the same as concentrating on the Self. Heart is another name for Self.
Ramana MaharshiWe loosely talk of Self-realization, for lack of a better term. But how can one realize that which alone is real? All we need to do is to give up our habit of regarding as real that which is unreal. All religious practices are meant solely to help us do this.
Ramana MaharshiThe thing to do is to concentrate on the seer and not on the seen, not on the objects, but on the Light which reveals them.
Ramana Maharshi