Chapter 5 — Fifth Head of Doctrine: Of the Perseverance of the Saints
Section 8. Article 8: The Certainty of This Preservation. So it is not by their own merits or strength but by God’s undeserved mercy that they neither forfeit faith and grace totally nor remain in their downfalls to the end and are lost. With respect to themselves this not only easily could happen, but also undoubtedly would happen; but with respect to God it cannot possibly happen. God’s plan cannot be changed; God’s promise cannot fail; the calling according to God’s purpose cannot be revoked; the merit of Christ as well as his interceding and preserving cannot be nullified; and the sealing of the Holy Spirit can neither be invalidated nor wiped out.