I'm reading, as a daily meditation, New Seeds of Contemplation by Thomas Merton.
It is, and will always remain, the book that took me deeper into true self than any other book:
“Everyone of us is shadowed by an illusory person: a false self...We are not very good at recognizing illusions, least of all the ones we cherish about ourselves. Contemplation is not and cannot be a function of this external self. There is an irreducible opposition between the deep transcendent self that awakens only in contemplation, and the superficial, external self which we commonly identify with the first person singular. Our reality, our true self, is hidden in what appears to us to be nothingness...We can rise above this unreality and recover our hidden reality...(281) God Himself begins to live in me not only as my Creator but as my other and true self.”