כִּ֤י הֶֽהָרִים֙ יָמ֔וּשׁוּ וְהַגְּבָע֖וֹת תְּמוּטֶ֑נָה וְחַסְדִּ֞י מֵאִתֵּ֣ךְ לֹֽא־יָמ֗וּשׁ וּבְרִ֤ית שְׁלוֹמִי֙ לֹ֣א תָמ֔וּט אָמַ֥ר מְרַחֲמֵ֖ךְ יְהוָֽה׃ (ס)
For the mountains may depart, and the hills be removed; but My kindness shall not depart from thee, neither shall My covenant of peace be removed, saith the LORD that hath compassion on thee.
Read Jewish philosophy on Isaiah 54:10: Rambam's Guide for the Perplexed, Saadia Gaon, and classical Jewish philosophical sources, free online.