Among the great questions of the human heart, none is more central than the question, “Who am I?” And among the great answers of the human spirit, none is more central than the experience of “I Am.” In fact, in the course of an intensely lived human life — a normal human life filled with the search for Truth — this question and this answer eventually run parallel to each other, coming closer and closer together until the question becomes the answer and the answer becomes the question.
— Jacob Needleman, from his book I Am Not I
Much more on the book in another thoughtful review by Maria Popova on the site BrainPickings.