Augustine of Hippo

"From the hand of strange children." Hear, brethren, among whom we are, among whom we live, from whom we long to be delivered. "Whose mouth has spoken vanity" [Psalm 144:8]. All of you today, if you had not gathered yourselves together to these divine shows of the word of God, and were not at this hour engaged in them, how great vanities would ye be hearing! "whose mouth has spoken vanity:" when, in short, would they, speaking vanity, hear you speaking vanity? …

Exposition on Psalm 144 ↗

Jerome

Whose mouth has spoken vanity. They promise themselves knowledge, and they raise up their mouth against their Creator. 'They have set their mouth against heaven.' Whose mouth has spoken vanity. Their knowledge is the knowledge of vanity. And their right hand is the right hand of iniquity. Both are condemned, both mouth and hand, both knowledge and works. Whose mouth has spoken vanity: this to knowledge. And their right hand is the right hand of iniquity. The right hand, in work. …

Homily 54, on Psalm 143 ↗