But the next day St. Patrick boldly came back, though he knew the King meant to kill him. He was given a cup of poisoned wine to drink. Well, what of that? Did not Our Lord say to His disciples, when He sent them out to convert the world, "If you drink any deadly thing it shall not hurt you"? St. Patrick made the sign of the cross over the cup and drank it, and nothing happened. Then the Druids arranged a horrible test. They laid two great fires, one of dry faggots and the other of wet, green wood. On the dry wood they laid the boy Benignus, dressed in a Druid's white robe. On the green they put a Druid, clad in St. Patrick's cloak. Then they said they would set fire to both piles. St. Patrick accepted the challenge. (If you had been the boy, would you have "got the wind up," do you think, or would you have trusted St. Patrick?) Well, they set fire to the two piles of wood. Strange to say, the green wood blazed up, with many sizzlings and cracklings and much smoke, but the dry wood simply wouldn't light. There was, however, a sudden flame, and the Druid's robe on the boy flared up and was soon burnt to ashes, leaving Benignus quite all right, and, I expect, very pleased with himself! Meanwhile, horrible noises had been coming from the other pile, and when the smoke and flames died down there were only charred cinders where there had once been a Druid. But St. Patrick's cloak had not been burnt at all. As the King still would not believe, St. Patrick had to make another earthquake happen, which swallowed up so many of the King's subjects that he gave in, and said St. Patrick might preach, though he himself never accepted the Faith. So, on the green plains of Tara, St. Patrick preached a wonderful sermon to the Irish, who by this time had come crowding round to see the stranger who could beat the Druids at their own game. During this sermon St. Patrick stooped down and picked a leaf of shamrock, and, holding it up, showed the people how the little green leaf was _three_ and yet _one_. He said that would help them to understand how the Blessed Trinity is three--God the Father, God the Son, and God the Holy Ghost--and yet is really only _one God_. That is why the Irish wear shamrock on St. Patrick's Day (March 17th). [Illustration: S. PATRICK AND THE LITTLE BOY BENIGNUS. _See page 101._] Many more miracles did St. Patrick which I can't tell you about now; and he went from place to place, winning thousands of men for Christ, and giving spiritual life to their souls by baptizing them.