כֹּה־אָמַ֨ר יְהוָ֥ה עֹשֶׂ֛ךָ וְיֹצֶרְךָ֥ מִבֶּ֖טֶן יַעְזְרֶ֑ךָּ אַל־תִּירָא֙ עַבְדִּ֣י יַֽעֲקֹ֔ב וִישֻׁר֖וּן בָּחַ֥רְתִּי בֽוֹ׃
造你、從母腹中塑造你、又要幫助你的永恆者如此說：我的僕人雅各，我所揀選的耶書崙啊，不要懼怕！
Rashi
Despised and rejected by men was he. So is the custom of this prophet: he mentions all Israel as one man, e.g., (44:2), “Fear not, My servant Jacob”; (44:1) “And now, hearken, Jacob, My servant.” Here too (52:13), “Behold My servant shall prosper,” he said concerning the house of Jacob. יַשְׂכִּיל is an expression of prosperity. Comp. (I Sam. 18:14) “And David was successful (מַשְׂכִּיל) in all his ways.”