If I do not believe in my heart these awful truths [how God saved me from hell] – believe them so that they are real in my feelings – then the blessed love of God in Christ will scarcely shine at all. The sweetness of the air of redemption will be hardly detectable. The infinite marvel of my new life will be commonplace. The wonder that to me, a child of hell, all things are given for an inheritance will not strike me speechless with trembling humility and lowly gratitude. The whole affair of salvation will seem ho-hum, and my entrance into paradise will seem as a matter of course. When the heart no longer feels the truth of hell, the gospel passes from good news to simply news. The intensity of joy is blunted and the heart-spring of love is dried up.
John Piper