"Preaching is not the proclamation of a theory, or the discussion of a doubt. A man has a perfect right to proclaim a theory of any sort, or to discuss his doubts. But that is not preaching. 'Give me the benefit of your convictions, if you have any. Keep your doubts to yourself; I have enough of my own,' said Goethe. We are never preaching when we are hazarding speculations. Of course we do so. We are bound to speculate sometimes. I sometimes say: 'I am speculating; stop taking notes.' Speculation is not preaching. Neither is the declaration of negations preaching. Preaching is the proclamation of the Word, the truth as the truth has been revealed."
-G. Campbell Morgan
"Preaching is theology coming through a man who is on fire"