The valleys are filled in. The road to God becomes level. Our roads are crooked. People today are taking the twisted, crooked way. Depravity and indecency is now acceptable.
Sexual sin is entertainment.
Violence is interesting. Children learn these things instead of the straight road of right character, honesty, purity, and justice. The road leads anywhere, everywhere, except to God. This will not stand. The prophet calls us to make our paths straight for the Lord's to come to us.