"The Practice of the Presence of God," compiled by Father Joseph de Beaufort, is a collection of the wisdom and teachings of Brother Lawrence, a 17th century Carmelite monk. This collection of letters and other records records his conversations, thoughts, and philosophy, chiefly a development of an awareness of the presence of God.
The book one must read to learn natural sciences is the book of nature. The book from which to learn religion is your own mind and heart.
-Swami Vivekananda