"Perhaps the most prominent feature in New Testament preaching is the sense of divine compulsion" [R.H.Mounce, The New Bible Dictionary, Inter-Varsity Press, London, 1962, p1023]
I think R.H. Mounce is probably right.
Jesus said: "Let us go somewhere to the towns nearby so that I may preach there also, for that is what I came for" (Mark1:38)
Peter and John said: "Whether it is right in the sight of God to give heed to you rather than to God, you be the judge, for we cannot stop speaking about what we have seen and heard" (Acts4:19,20)
Paul said: "If I preach the gospel I have nothing to boast of for I am under compulsion, for woe is me if do not preach the gospel" (1Cor9:16)
Mr Mounce continues: "[New Testament] preaching is not the relaxed recital of interesting but morally neutral truths, it is God Himself breaking into the affairs of man and confronting him with a demand for a decision. This sort of preaching meets with opposition".
Makes you think, doesn't it?