"But perhaps the best way of reaching a definition is to ask; what is the difference between prophecy on the one hand and preaching and teaching on the other? Because there is a difference. And I would say that the difference is one word. Immediacy. And this means that a word is given to people and comes to them. Now preaching and teaching are not like that. A preacher and teacher is a man who takes time to study, he takes time to think, to prepare; he arranges his material and gives it order and system. A preacher and teacher should not enter into the pulpit without any preparation and trust to the inspiration of the moment".
Dr Martyn Lloyd-Jones - "Romans - Exposition of Chapter 12" - Banner of Truth, Edinburgh (2000) - (p236-237).