Bhagwan Shri Raman Maharshi's definition of the Self

That in which all these worlds seem to exist steadily, that of which all these worlds are a possession, that from which all these worlds rise, that for which all these exist, that by which all these worlds come into existence and that which is which all these worlds come into existence and that which is indeed all these – that alone is the existing reality. Let us cherish that Self, which is the reality, in the Heart.