Isaiah 35:8-10. “And an highway shall be there, and a way, and it shall be called The way of holiness; the unclean shall not pass over it; but it shall be for those: the wayfaring men, though fools, shall not err therein. No lion shall be there, nor any ravenous beast shall go up thereon, it shall not be found there; but the redeemed shall walk there: And the ransomed of the Lord shall return, and come to Zion with songs and everlasting joy upon their heads: they shall obtain joy and gladness, and sorrow and sighing shall flee away.”
A highway will be built from Egypt through Palestine to Assyria and all people will traffic on it, going up to Jerusalem to worship the Lord and keep the feast of tabernacles (2:2-4; 11:16; 19:23-5; 66:19-21; Zech. 14:16-21).
Some interpret this highway as simply being a way of life, but the text indicates an actual roadway being used by people traveling to Jerusalem for the purpose of worshiping God in spirit and in truth. This is not a metaphorical highway. It is limited to the redeemed.
But wait! Aren’t all people in the Millennium redeemed, accepting Jesus as Messiah? Sadly, no. There will be those who still have a spirit of rebellion, and they will be dealt with quickly when they are discovered. They will not have access to the highway of holiness.
Verse 10 refers to Israelites from all over the world who will return to Zion to worship God, fulfilling the prophecies in 11:10-12; 66:19-21; Ezek. 37; Matt. 24:31. Then, the ransomed and redeemed will continually traffic on this highway year after year to worship (2:2-4; Zech. 14:16-21).
Sorrow (grief, regret) and sighing (disappointment) will always flee when one returns to God: then, instead of these there will be singing, joy and gladness (v. 10).