_In those days Hezekiah became sick unto death._ They were critical days for Judah--no son born to the king (2 Kings xxi. 1), the work of reformation in Judah not yet consolidated, the big world tossing in revolution all around. Under God, everything depended on an experienced ruler; and this one, without a son to succeed him, was drawing near to death. We will therefore judge Hezekiah's strong passion for life to have been patriotic as well as selfish. He stood in the midtime of his days, with a faithfully executed work behind him and so good an example of kinghood that for years Isaiah had not expressed his old longing for the Messiah. The Lord had counted Hezekiah righteous; that twin-sign had been given him which more than any other assured an Israelite of Jehovah's favour--a good conscience and success in his work. Well, therefore, might he cry when Isaiah brought him the sentence of death, _Ah, now, Jehovah, remember, I beseech Thee, how I have walked before Thee in truth and with a perfect heart, and have done that which is good in Thine eyes. And Hezekiah wept with a great weeping._ There is difficulty in the strange story which follows. The dial was probably a pyramid of steps on the top of which stood a short pillar or obelisk. When the sun rose in the morning, the shadow cast by the pillar would fall right down the western side of the pyramid to the bottom of the lowest step. As the sun ascended the shadow would shorten, and creep up inch by inch to the foot of the pillar. After noon, as the sun began to descend to the west, the shadow would creep down the eastern steps; and the steps were so measured that each one marked a certain degree of time. It was probably afternoon when Isaiah visited the king. The shadow was _going down_ according to the regular law; the sign consisted in causing the shadow to shrink up the steps again. Such a reversal of the ordinary progress of the shadow may have been caused in either of two ways: by the whole earth being thrown back on its axis, which we may dismiss as impossible, or by the occurrence of the phenomenon known as refraction. Refraction is a disturbance in the atmosphere by which the rays of the sun are bent or deflected from their natural course into an angular one. In this case, instead of shooting straight over the top of the obelisk, the rays of the sun had been bent down and inward, so that the shadow fled up to the foot of the obelisk. There are many things in the air which might cause this; it is a phenomenon often observed; and the Scriptural narratives imply that on this occasion it was purely local (2 Chron. xxxii. 31). Had we only the narrative in the book of Isaiah, the explanation would have been easy. Isaiah, having given the sentence of death, passed the dial in the palace courtyard, and saw the shadow lying ten degrees farther up than it should have done, the sight of which coincided with the inspiration that the king would not die; and