Bad theology dishonors God and hurts people. Churches that sever the root of truth may flourish for a season, but they will wither eventually or turn into something besides a Christian church.
John PiperIf we have no zeal for the glory of God our mercy must be superficial, man-centred human improvement with no eternal significance. And if our zeal for the glory of God is not a revelling in his mercy, than our so-called zeal, in spite of all its protests, is our of touch with God and hypocritical.
John PiperThe task of all Christian scholarshipโnot just biblical studiesโis to study reality as a manifestation of Godโs glory, to speak and write about it with accuracy, and to savor the beauty of God in it, and to make it serve the good of man. It is an abdication of scholarship when Christians do academic work with little reference to God. If all the universe and everything in it exist by the design of an infinite, personal God, to make his manifold glory known and loved, then to treat any subject without reference to Godโs glory is not scholarship but insurrection.
John PiperThe assurance of the believer is not that God will save him even if he stops believing, but that God will keep him believing--God will sustain you in faith, he will make your hope firm and stable to the end. He will cause you to persevere.
John Piper