Komentarz do Izajasza 40:4

Every valley shall be raised and the mountain shall be lowered, thus resulting in a smooth, even, and easily traversed road.

"Every valley". He is describing how the path that is remembered which the children of exile will return on will be a straight path; the valleys and ridges will not delay them. Although it will be said that it will not be like the normal actions of the world that at the time that they want to straighten the way and a mountain and a hill and a valley is found in front of it, that then the mountain soil will travel into the valley, until the mountain is lowered and the valley is raised, in a way that according to nature a mountain and a hill will first be forced to be lowered, and because of this the valley will be filled. But if it will be that it is not by the way of nature, it will start out "Let every be raised," from itself, and afterwards, "Every hill and mountain be made low"....

"The rugged ground". Isolated, and it is from the topic of the ambush 'but the far end of it was on the west.' (Joshua 8:13), which fenced the circular road that surrounded the counterpart with deception or action with slyness, and thus the place they were at was called ridges, which are raised humps attached together (from 'The breastpiece shall be held in place' (Exodus 28:28)), until you have to go around and encircle the road, which is a place of rugged ground.