Preaching - "Logic on fire"

Martin Lloyd-Jones says:
What is preaching? Logic on fire! Eloquent reason! Are these contradictions? Of course they are not. Reason concerning this Truth ought to be mightily eloquent, as you see it in the case of the Apostle Paul and others. It is theology on fire. And a theology which does not take fire, I maintain, is a defective theology; or at least the man's understanding of it is defective. Preaching is theology coming through a man who is on fire. A true understanding and experience of the Truth must lead to this. I say again that a man who can speak about these things dispassionately has no right whatsoever to be in a pulpit; and should never be allowed to enter one. What is the chief end of preaching? I like to think it is this. It is to give men and women a sense of God and His presence.