'I am baptized on Christ, and I entrust myself solely to Him; for He is my Life, Salvation, and Wisdom.' Wherever such words proceed from faith, they generate a completely fiery atmosphere, which burns and pains the devil so that he cannot tarry. But if a person is without warmth about matters pertaining to God and salvation, as the common man does, then the devil merely laughs. But if your words are aglow in your heart, you will put the devil to flight.
--Martin Luther, preaching on John 3:16, in LW 22:357