“Sanctification, therefore, must be understood as being both definitive and progressive. In its definitive sense, it means that work of the Spirit whereby He causes us to die to sin, to be raised with Christ, and to be made new creatures. In its progressive sense, it must be understood as that work of the Spirit whereby He continually renews and transforms us into the likeness of Christ, enabling us to keep on growing in grace and to keep on perfecting our holiness.”
John F. Walvoord (May 1, 1910 - December 20, 2002) was a Christian theologian, pastor, and president of Dallas Theological Seminary from 1952 to 1986. He was the author of over 30 books, focusing primarily on eschatology and theology including The Rapture Question, and was co-editor of The Bible Knowledge Commentary with Roy B. Zuck. He earned AB and DD degrees from Wheaton College, an AM degree from Texas Christian University in philosophy, a ThB, ThM, and ThD in Systematic theology from Dallas Theological Seminary, and a LittD from Liberty Baptist Seminary.
In addition to his responsibilities at the seminary, Walvoord earned a reputation as one of the most influential dispensational theologians of the twentieth century and played a prominent role in advocating a rapture of Christians from the earth prior to a time of great tribulation, followed by a literal thousand-year millennial reign of Christ, and a renewed focus of God on the nation of Israel as distinct from the church.