'Message' in the Bible

Whom will he teach knowledge? To whom will he explain the message? Those who are weaned from the milk, and drawn from the breasts?

As often as it passes through, it will seize you; for morning by morning it will pass through, by day and by night; and it will be nothing but terror to understand the message."

Who has believed our message? To whom has the arm of Yahweh been revealed?