“But to preach is the most difficult of all arts and is essentially the art that Socrates praised, the art of being able to converse. It goes without saying that the need is not for someone in the congregation to provide an answer or that it would be of help continually to introduce a respondent. What Socrates criticized in the Sophists, when he made the distinction that they indeed knew how to make speeches but not how to converse, was that they could talk at length about every subject, but lacked the element of appropriation. Appropriation is precisely the secret of conversation.”
Søren Kierkegaard, The Concept of Anxiety, 16.