"The possibility of rejection was ever present. St. Paul did not establish himself in a place and go on preaching for years to men who refused to act on his teaching. When once he had brought them to a point where decision was clear, he reminded that they should make their choice. If they rejected him, he rejected them. The 'shaking of the lap', the 'shaking of the dust from the feet', the refusal to teach those who refused to act on the teaching, was a vital part of the Pauline presentation of the Gospel. He did not simply “go away;” he openly rejected those who showed themselves unworthy of his teaching. It was part of the Gospel that men might “judge themselves unworthy of eternal life.” It is a question which needs serious consideration whether the Gospel can be truly presented if this element is left out. Can there be true teaching which does not involve the refusal to go on teaching? . . . If then we go on teaching where that moral response is refused , we cease to preach the Gospel; we make the teaching a mere education of the intellect."Holy snap! I have been a full time evangelist for years and this has never occurred to me. Fascinating. This is from Roland Allen's book Missionary Methods: St. Paul's or Ours? A book which I'm still chewing on slowly.
(For $2 on Kindle you almost cant afford to NOT read it.)