The method of our salvation; it was not sufficient to obtain salvation once, unless it could be perpetually preserved and applied. Christ obtained the former by his satisfaction, but the ladder he should procure by his intercession. By the former, he obtained salvation; by the latter he preserves it. By the former, he purchased the right to life and reconciled us to God; by the latter, he actually admits us to a participation of life and continually keeps us when once established in the grace of God.

— Francis Turretin, Institutes of Elenctic Theology, 14.15.3