The Most Ancient Lives of Saint Patrick/The Life and Acts of St. Patrick/Chapter 160
Of the Work which was done in the Lord's Day.
And at a certain time Saint Patrick on the Lord's day entered a harbor on the northern coast of Hibernia, opposite the town of Druimbo; yet would he not go forth of the ship, but remaining therein he solemnized the day with his wonted devotion. And now was the mid-hour of the day passed, when he heard no little noise; whereby he understood that the heathens were violating the Sabbath with their profane labors (the which was right contrary to his custom and command); and that they were then employed in a certain work which is called rayth; that is, a wall. And thereat being somewhat moved, he ordered that they should be bidden before him, and imperatively commanded them on that day to surcease from their labor. But this profane and foolish generation received the prohibition of the saint not only with contempt, but with scorn and laughter. Then did he, understanding the perverseness of those scorners, repeat his prohibition, and thus did he say unto them, "Though mightily shall ye labor unto your purpose, never shall it come to any effect, nor ever shall ye derive any profit therefrom." And how true were his words, the event showed: for on the next night was the sea wondrously raised with a tempest, and spreading thereover scattered all the work of the heathens; and lest ever it should be recollected or rebuilded, dispersed it with irreparable dispersion.