6. all flesh, &c.—(quoted literally from the Septuagint of Isa 40:5). The idea is that every obstruction shall be so removed as to reveal to the whole world the Salvation of God in Him whose name is the "Saviour" (compare Ps 98:3; Isa 11:10; 49:6; 52:10; Lu 2:31, 32; Ac 13:47).