לִמְד֥וּ הֵיטֵ֛ב דִּרְשׁ֥וּ מִשְׁפָּ֖ט אַשְּׁר֣וּ חָמ֑וֹץ שִׁפְט֣וּ יָת֔וֹם רִ֖יבוּ אַלְמָנָֽה׃ (ס)
Learn to do well; Seek justice, relieve the oppressed, Judge the fatherless, plead for the widow.
Read Jewish philosophy on Isaiah 1:17: Rambam's Guide for the Perplexed, Saadia Gaon, and classical Jewish philosophical sources, free online.