What will this boaster produce worthy of this mouthing? The mountains are in labor; a ridiculous mouse will be born. Horace, Ars Poetica (18 BC), 138. Athenæus, Deipnosophists, 14. 7. (A preserved fragment). Phædrus, IV. 22.
The mountains will be in labor, and a ridiculous mouse will be brought forth. Horace is hereby poking fun at heroic labours producing meager results; his line is also an allusion to one of Æsop's fables, The Mountain in Labour. The title to Shakespeare's play Much Ado About Nothing expresses a similar sentiment. Line 139.