According to Promise: Or the Lord’s Method of Dealing with His Chosen People (1887)

It would be very difficult to say how far a man may go in religion, and yet die in his sins; how much he may look like an heir of heaven, and yet be a child of wrath. Many unconverted men have a belief which is similar to faith, and yet it is not true faith. Certain persons exhibit pious affections which have the warmth of spiritual love; but are quite destitute of gracious life. Every grace can be counterfeited, even as jewels can be imitated The life of God within the soul creates an infinite difference between the man who has it and the man who has it not; and the point is, to make sure that we have this life. Are YOU sure that you have it? C.H. Spurgeon Many Christians seem to live their lives at less than 50% of their potential! But God has promises that apply to every believer no matter what their situation. If your life is lacking in promise then look to Gods promises to see what it could become. Spurgeons premise in this book is that many people who appear to be Christians are not fully living under Gods promises of salvation through Christ and of fruitful Christian living. This is an ideal book for those who are at church but who lack assurance of faith. Spurgeons style of writing is like his sermons direct, profound, vividly illustrated and faithdirecting. That is why his books have sold in the tens of millions and are still published for Christians today as relevant now because the content reflects eternal truths.