Psalms 9:21 Kabbalah

שִׁ֘יתָ֤ה יְהוָ֨ה ׀ מוֹרָ֗ה לָ֫הֶ֥ם יֵדְע֥וּ גוֹיִ֑ם אֱנ֖וֹשׁ הֵ֣מָּה סֶּֽלָה׃

Set terror over them, O LORD; Let the nations know they are but men. Selah

Read kabbalistic (mystical) interpretation of Psalms 9:21: and classical mystical sources.