אֲנִ֧י יְהוָ֛ה קְרָאתִ֥יךָֽ בְצֶ֖דֶק וְאַחְזֵ֣ק בְּיָדֶ֑ךָ וְאֶצָּרְךָ֗ וְאֶתֶּנְךָ֛ לִבְרִ֥ית עָ֖ם לְא֥וֹר גּוֹיִֽם׃
Yo SEÑOR te he llamado en justicia, y te tendré por la mano; te guardaré y te pondré por alianza del pueblo, por luz de las gentes;
Ibn Ezra on Isaiah
I, the Lord, have called thee, etc. The Lord in these words addresses the prophet upon his own concerns.
Rashi on Isaiah
and I formed you Heb. וְאֶצָּרְךָ. When I formed you (כְּשֶׁיְצַרְתִּיךָ), this was My thought, that you return My people to My covenant and to enlighten them.