(Isaiah 35:8) It will be noticed that there is a way to go over this highway, and it shall be called "The way of holiness".

In other words, those who pass over it will be made holy.

The highway pictures the whole journey from the beginning to the end of the Millennial reign of Christ.

The unclean shall not pass over it, because unless a man will be cleaned up before he progresses a great way, he will be permitted to go no further.

But as he strives to cleanse himself and be obedient to the Lord, he will be helped.