A classic study on whether salvation can be lost. In this classic study (published originally in 1969 and republished with a new substantive now), Marshall looks at a key theological issue in the New Testament, the perseverance of believers. In a setting of persecution, the question of perseverance is one that arises often in the NT texts, and it is an important pastoral issue still today. But it is also extremely useful as a lens through which to view the NT understanding of salvation, election, judgment, and many other interconnected ideas. In short, it is a vital test case, or maybe better put, it is essential data for a robust NT doctrine of God and of salvation. Marshall digs in to the relevant NT texts by first investigating the OT and Jewish background concerning perseverance. He then moves through the various corpora in the NT: the Synoptics, Acts, Paul, Pastorals (may or may not be by Paul, but treated separately from though with an eye toward the undisputed Pauline corpus), Hebrews, the Catholics, and the Johannine literature. This systematic study is largely exegetical, as Marshall works carefully with the individual texts on their own before summing up each author's perspective.