'Message' in the Bible

Whom will he teach knowledge? and whom will he make to understand the message? them that are weaned from the milk, and drawn from the breasts?

As often as it passeth though, it shall take you; for morning by morning shall it pass through, by day and by night: and it shall be nought but terror to understand the message.

Who hath believed our message? and to whom hath the arm of Jehovah been revealed?