John Gill

Let them give glory unto the Lord,.... For all the great and good things he has done for them, in sending his Gospel to them, calling them by his grace, enlightening their minds, and revealing his Son in them, and making them partakers of the blessings of his grace, and entitling them to eternal glory and happiness: and declare his praise in the islands; as on the western continent, and the isles of it; so on the eastern continent, and the islands of it, the islands of Greece, the islands in the Aegean sea.