What is the Midnight Message of Our Day?

And so through the night went his cry of alarm To every Middlesex village and farm, A cry of defiance, and not of fear, A voice in the darkness, a knock at the door, And a word that shall echo for evermore! For, borne on the night-wind of the Past, Through all our history, to the last, In the hour of darkness and peril and need, The people will waken and listen to hear The hurrying hoof-beats of that steed, And the midnight message of Paul Revere.