Tozer is awesome and this book full of his usual simple and inspirational writing.
My favourite quote (from the preface):
"For it is not mere words that nourish the soul, but God Himself, and unless and until the hearers find God in personal experience they are not the better for having heard the truth. The Bible is not an end in itself, but a means to bring men to an intimate and satisfying knowledge of God, that they may enter into Him, that they may delight in His Presence, may taste and know the inner sweetness of the very God Himself in the core and center of their hearts."