A fiery shield is God's Word; of more substance and purer than gold, which, tried in the fire, loses nought of its substance, but resists and overcomes all the fury of the fiery heat; even so, he that believes God's Word overcomes all, and remains secure everlastingly, against all misfortunes; for this shield fears nothing, neither hell nor the devil.

The table talk or familiar discourse of Martin Luther, tr. by W. Hazlitt (ed. 1848)