לְמַ֙עַן֙ עַבְדִּ֣י יַעֲקֹ֔ב וְיִשְׂרָאֵ֖ל בְּחִירִ֑י וָאֶקְרָ֤א לְךָ֙ בִּשְׁמֶ֔ךָ אֲכַנְּךָ֖ וְלֹ֥א יְדַעְתָּֽנִי׃
For the sake of Jacob My servant, and Israel Mine elect, I have called thee by thy name, I have surnamed thee, though thou hast not known Me.
Read kabbalistic (mystical) interpretation of Isaiah 45:4: and classical mystical sources.