כִּ֚י בְּלַעֲגֵ֣י שָׂפָ֔ה וּבְלָשׁ֖וֹן אַחֶ֑רֶת יְדַבֵּ֖ר אֶל־הָעָ֥ם הַזֶּֽה׃
For with stammering lips and with a strange tongue Shall it be spoken to this people;
Read kabbalistic (mystical) interpretation of Isaiah 28:11: and classical mystical sources.