The 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 PiperWithout the renewed mind, we will distort the Scriptures to avoid their radical commands for self-denial, and love, and purity, and supreme satisfaction in Christ alone.
John PiperFrom eternity to eternity, the beauty of God is pervasive and practical. Ask him to open the eyes of your heart (Ephesians 1:18). Give your life to this quest - seeing and savoring more and more of the happifying beauty of God.
John Piper