John Wesley on 2 Chronicles 7:1

The fire &c. - In token of God's acceptance of his prayer. The surest evidence of God's acceptance of our prayers is the descent of his holy fire upon us. As a farther token that God accepted Solomon's prayer, the glory of the Lord filled the house; the heart that is filled with an holy awe and reverence of the divine glory, to which God manifests his greatness, and (which is no less his glory) his goodness, is thereby owned as a living temple.