Ramana Maharshi

When meditating on the seer, there is a mental vibration ‘I’ to which all are reduced. The source of this 'I’ is the primal 'I-I’. It is the inexpressible seat of Realization and the core of all beings. Hence it a called the Heart. The only useful purpose of the present birth is to see it in all things. There is nothing else to do.