Horace Quotes about Silence
Once a word has been allowed to escape, it cannot be recalled.
"Epistles" by Horace, Book I, epistle xviii, line 71, c. 20 BC and 14 BC.
"Epistles", I. 17. 50, as quoted in Hoyt's New Cyclopedia Of Practical Quotations, p. 690-91, 1922.