We are thine... — Thine, as the italics show, is not in the Hebrew, and its insertion distorts the meaning. Better, We are become as those over whom Thou hast never ruled, upon whom Thy name hath never been called (Cheyne). What the prophet presents as a plea is not the contrast between Israel and the heathen, but the fact that Israel has been left to sink to the level of the heathen who had not known God. Would not that thought move Jehovah, as it were, to remember this covenant?
Related Commentaries of Isaiah 63:19
Isaiah 63:19
19 We are thine: thou never barest rule over them; they were not called by thy name.