Does diachronic faith undermine perseverance and regeneration?

A reader asks whether adopting a Federal Vision-like perspective on faith and justification can stop there. Must it not logically lead us to deny the perseverance of the saints, and in turn the Reformed understanding of regeneration? I explain why I think this is broadly mistaken.

Faith across time: is final justification unchristian?

Final justification does not add anything to the conditions of justification; nor does it entail that God grounds his verdict in our works rather than in his Son’s. On the contrary, final justification is on account of the very same faith that first joined us to Jesus and his vindication—and our works are a proper part of that faith.