It sometimes happens, when we are dispirited, that God's gracious gift of reviving comes to us along a very ordinary channel--in the form, perhaps, of some tonic, heartening passage found in reading, or the "morning face" and cheerful greeting of a friend. That is often all that we need--when our hurt is not serious-- to send us back with a new zest and courage to our tasks; and that is the sort of usefulness which is desired for this book.