אָכֵ֥ן לַשֶּׁ֛קֶר מִגְּבָע֖וֹת הָמ֣וֹן הָרִ֑ים אָכֵן֙ בַּיהֹוָ֣ה אֱלֹהֵ֔ינוּ תְּשׁוּעַ֖ת יִשְׂרָאֵֽל׃
Truly vain have proved the hills, The uproar on the mountains; Truly in the LORD our God Is the salvation of Israel.
Read kabbalistic (mystical) interpretation of Jeremiah 3:23: and classical mystical sources.