Psalms 135:17 Kabbalah

אָזְנַ֣יִם לָ֭הֶם וְלֹ֣א יַאֲזִ֑ינוּ אַ֝֗ף אֵין־יֶשׁ־ר֥וּחַ בְּפִיהֶֽם׃

They have ears, but they hear not; Neither is there any breath in their mouths.

Read kabbalistic (mystical) interpretation of Psalms 135:17: and classical mystical sources.