What I want to do in this book is to show, in my small measure, what I firmly believe, that the kingdom of God could not possibly be over-advertised, nor the Lord Jesus Christ overestimated, "for eye has not seen, nor ear heard, neither has entered into the heart of man, the things which God has prepared for them that love Him;" (1 Corinthians 2:9) and that all the difficulty arises from the fact that we have under-believed and under-trusted. — Hannah Whitall Smith.