“The man who hears God speak and can still inquire about the act corresponding, would simply show thereby that he actually has not heard God speak. We might, for example, hear Christian sermons preached and ask ourselves: What happens in virtue of the fact that this thing happens? To all these words what corresponds in reality? A question that most certainly needs raising! We might listen to Holy Scripture and hear only words, a man’s words, which we do or do not understand, but along with which invariably the corresponding event is still wanting. It is then sure that in the proclamation as in the Bible what we heard was not the Word of God. Had it been the Word of God, we would never have been looking around for God’s acts. The Word of God itself would have been the act. The Word of God needs no supplementing by the act. The Word of God is itself the act of God… The Word of God in the highest sense makes history.” (Church Dogmatics, I/1, p163)
The Word is the act.
Therefore preaching is practical.