The glory of the Lord shall be revealed: so it was in some sort, when God brought them out of Babylon, which was a glorious work of God; but far more properly and eminently when Christ, who was the glorious God, was manifested in the flesh, and gave much clearer and fuller discoveries of God's glorious wisdom, and holiness, and goodness, and other Divine perfections, than ever yet had been imparted to mankind and to the church. All flesh; all nations, both Jews and Gentiles. For the mouth of the Lord hath spoken it; though this may seem incredible, yet God is able to accomplish it.
Related Commentaries of Isaiah 40:5
Isaiah 40:5
5 And the glory of the LORD shall be revealed, and all flesh shall see it together: for the mouth of the LORD hath spoken it.