This escape from a sudden and dreadful death, affected Prince Henry deeply. He was a boy of strong religious feelings. And from this time he never suffered any business to keep him from hearing a sermon every Tuesday, which was the day of the week on which the Gunpowder Plot was to have been carried out. But hearing of sermons was not the only sign of Prince Henry's piety. He was diligent in his own private prayers, generally going apart three times a day to pray quietly by himself. He was most careful too of the good behavior of his household. And above all things he had a horror of profane swearing. At his three palaces, St. James's in London, Richmond, and Nonsuch, he ordered boxes to be kept for the fines he exacted from all those who used bad words; and this money was given to the poor. There is a story told by Coke, the historian, how that the prince was once hunting a stag. The stag was spent, and crossing a road fell in with a butcher and his dog. The dog killed the stag; and when the hunting party came up and found their sport was over they were enraged, and tried to incense the prince against the butcher. But Henry answered quietly: "What if the butcher's dog killed the stag? Could the butcher help it?" The rest replied that if the king had been so served "he would have sworn so as no man could have endured it." "_Away_," rejoined the prince; "_all the pleasure in the world is not worth an oath_."[73] [Illustration: HENRY FREDERICK, PRINCE OF WALES.] The prince was keenly interested in all foreign countries, and kept himself well informed upon their politics and customs by the large correspondence he now carried on with distinguished persons both at home and abroad. When he was just thirteen his curiosity caused no little amusement at the French Court. Prince Henry had long wished for an opportunity of learning something about the fortifications of Calais. And when the Prince de Joinville, who had been on a visit to England, returned to Paris, Henry sent an engineer of his own in the French prince's train, who made a careful examination of Calais and of the Rix-bank. This came to the ears of the French ambassador, who wrote in hot haste to the Court at Fontainebleau and to the Governor of Calais. But Henri Quatre was only entertained at the boyish inquisitiveness of his young cousin, and sent back word that he did not consider the occurrence betokened any dangerous designs upon the kingdom of France.