The first and primary object of preaching is not only to give information. It is, as Edwards says, to produce an impression. It is the impression at the time that matters, even more than what you can remember subsequently. In this respect Edwards is, in a sense, critical of what was a prominent Puritan custom and practice. The Puritan father would catechize and question the children as to what the preacher had said. Edwards, in my opinion, has the true notion of preaching. It is not primarily to impart information; and while you are writing your notes you may be missing something of the impact of the Spirit. As preachers we must not forget this. We are not merely imparters of information.
– Martyn Lloyd-Jones