The Fifth Head of Doctrine: The Perseverance of the Saints
Having set forth the orthodox teaching, the Synod rejects the errors of those
Who teach that the faith of those who believe only temporarily does not differ from justifying and saving faith except in duration alone.
For Christ himself in Matthew 13:20ff. and Luke 8:13ff. clearly defines these further differences between temporary and true believers: he says that the former receive the seed on rocky ground, and the latter receive it in good ground, or a good heart; the former have no root, and the latter are firmly rooted; the former have no fruit, and the latter produce fruit in varying measure, with steadfastness, or perseverance.
Having set forth the orthodox teaching, the Synod rejects the errors of those
Who teach that it is not absurd that a person, after losing his former regeneration, should once again, indeed quite often, be reborn.
For by this teaching they deny the imperishable nature of God’s seed by which we are born again, contrary to the testimony of the apostle Peter: Born again, not of perishable seed, but of imperishable (1 Pet. 1:23).
Daily Confession 