Jamieson, Fausset and Brown on Isaiah 58:12

12. they ... of thee--thy people, the Israelites.

old waste places--the old ruins of Jerusalem (Is 61:4; Eze 36:33-36).

foundations of many generations--that is, the buildings which had lain in ruins, even to their foundations, for many ages; called in the parallel passage (Is 61:4), "the former desolations"; and in the preceding clause here, "the old waste places." The literal and spiritual restoration of Israel is meant, which shall produce like blessed results on the Gentile world (Am 9:11, 12; Ac 15:16, 17).

be called--appropriately: the name truly designating what thou shalt do.

breach--the calamity wherewith God visited Israel for their sin (Is 30:26; 1Ch 15:13).

paths to dwell in--not that the paths were to be dwelt in, but the paths leading to their dwellings were to be restored; "paths, so as to dwell in the land" [Maurer].