The law of the religious affections is the same. They always imply the antecedent existence of faith. Religious faith, sustained by the Holy Spirit, but operating in a manner entirely analogous to the operations of natural faith, is undoubtedly the true basis of religious love. Without the key of faith the foundation of divine love, which refreshes and gives beauty to the whole soul, would never be opened within us. It would be impossible; because it would obviously be a result, not only without reason, but against reason. It is because we believe or have faith in God as just, benevolent and holy, as possessed of every possible perfection calculated to attract and secure our love, that we love him.
— The Life of Faith (1852) Part 1, Chapter 6.