They told him only of shadows and forebodings. Odin All-Father did not speak to the Dwellers in Asgard of the things they told him. But Frigga, his Queen, saw in his eyes the shadows and forebodings of things to come. And when he spoke to her about these things she said, "Do not strive against what must take place. Let us go to the holy Norns who sit by Urda's Well and see if the shadows and the forebodings will remain when you have looked into their eyes." And so it came that Odin and the Gods left Asgard and came to Urda's Well, where, under the great root of Ygdrassil, the three Norns sat, with the two fair swans below them. Odin went, and Tyr, the great swordsman, and Baldur, the most beautiful and the Best-Beloved of the Gods, and Thor, with his Hammer. A Rainbow Bridge went from Asgard, the City of the Gods, to Midgard, the World of Men. But another Rainbow Bridge, more beautiful and more tremulous still, went from Asgard to that root of Ygdrassil under which was Urda's Well. This Rainbow Bridge was seldom seen by men. And where the ends of the two rainbows came together Heimdall stood, Heimdall with the Golden Teeth, the Watcher for the Gods, and the Keeper of the Way to Urda's Well. "Open the gate, Heimdall," said the All-Father, "open the gate, for today the Gods would visit the holy Norns." Without a word Heimdall opened wide the gate that led to that bridge more colored and more tremulous than any rainbow seen from earth. Then did Odin and Tyr and Baldur step out on the bridge. Thor followed, but before his foot was placed on the bridge, Heimdall laid his hand upon him. "The others may go, but you may not go that way, Thor," said Heimdall. "What? Would you, Heimdall, hold me back?" said Thor. "Yes, for I am Keeper of the Way to the Norns," said Heimdall. "You with the mighty hammer you carry are too weighty for this way. The bridge I guard would break under you, Thor with the hammer." "Nevertheless I will go visit the Norns with Odin and my comrades," said Thor. "But not this way, Thor," said Heimdall. "I will not let the bridge be broken under the weight of you and your hammer. Leave your hammer here with me if you would go this way." "No, no," said Thor. "I will not leave in any one's charge the hammer that defends Asgard. And I may not be turned back from going with Odin and my comrades." "There is another way to Urda's Well," said Heimdall. "Behold these two great Cloud Rivers, Körmt and Ermt. Canst thou wade through them? They are cold and suffocating, but they will bring thee to Urda's Well, where sit the three holy Norns." Thor looked out on the two great rolling rivers of cloud. It was a bad way for one to go, cold and suffocating. Yet if he went that way he could keep on his shoulder the hammer which he would not leave in another's charge. He stept out into the Cloud River that flowed by the Rainbow Bridge, and with his hammer upon his shoulder he went struggling on to the other river.