“In ordinary Greek literature the kerux himself has a position of significance at the court. He is a very important man, to whom not only political but also religious significance is ascribed. He is a ‘sacral person’.  In the New Testament such connotations are absent, for the herald is not the main thing, but his work: the announcement of God’s salvation in Jesus Christ.”
 
K Runia 
What Is Preaching According To The New Testament? Tyndale Bulletin, 1978  p8

(For 10 years now, every Saturday, I have sent round a preaching related quote to hundreds of preachers around the world. These are mostly quotes that I have come across in my own reading, while some have been sent to me. You can find all of them at The Barnabas Files website where a new quote appears each week.)