אַל־תִּֽירְאִי֙ כִּי־לֹ֣א תֵב֔וֹשִׁי וְאַל־תִּכָּלְמִ֖י כִּ֣י לֹ֣א תַחְפִּ֑ירִי כִּ֣י בֹ֤שֶׁת עֲלוּמַ֙יִךְ֙ תִּשְׁכָּ֔חִי וְחֶרְפַּ֥ת אַלְמְנוּתַ֖יִךְ לֹ֥א תִזְכְּרִי־עֽוֹד׃
Fear not, for thou shalt not be ashamed. Neither be thou confounded, for thou shalt not be put to shame; For thou shalt forget the shame of thy youth, And the reproach of thy widowhood shalt thou remember no more.
Read Jewish philosophy on Isaiah 54:4: Rambam's Guide for the Perplexed, Saadia Gaon, and classical Jewish philosophical sources, free online.