To declare the name of the LORD in Zion, and his praise in Jerusalem;
Read Chapter 102
Augustine of Hippo
AD 430
21. "That the name of the Lord may be declared in Sion" (ver. 21). For at first, when the fettered were appointed unto death, the Church was oppressed: since these tribulations the Name of the Lord has been declared in Sion, with great freedom, in the Church herself. For she is Sion: not that one spot, at first proud, afterwards taken captive; but the Sion whose shadow was that Sion, which signifieth a watch-tower; because when placed in the flesh, we see into the things before us, extending ourselves not to the present which is now, but to the future. Thus it is a watch-tower: for every watcher gazes far. Places where guards are set, are termed watch-towers: these are set on rocks, on mountains, in trees, that a wider prospect may be commanded from a higher eminence. Sion therefore is a watch-tower, the Church is a watch-tower. ...If therefore the Church be a watch-tower, the Name of the Lord is already declared there. Not the Lord's Name only is declared in that Sion, but "His praise," He saith, "in Jerusalem."
