'Pouring out the vials upon the earth, which contained the plagues,' in Revelation 16:1, signifies influx of the reformed into the church, or into people who study and receive the doctrine of justification by faith alone.

(Odkazy: Apocalypse Explained 16; Apocalypse Revealed 676)

568. Spiritual heat in man is the heat of his life, because, as was said above, it is in its essence love. This heat is what is meant in the Word by "fire," love to the Lord and love towards the neighbor by "heavenly fire," and love of self and love of the world by "infernal fire."