parturiunt montes, nascetur ridiculus mus

Latin quotation from Horace

par·​tu·​ri·​unt mon·​tes, nas·​ce·​tur ri·​di·​cu·​lus mus pär-ˈtu̇r-ē-ˌu̇nt-ˈmȯn-ˌtās näs-ˈkā-ˌtu̇r-ri-ˌdi-ku̇-lu̇s-ˈmüs 

: the mountains are in labor, (and) an absurd mouse will be born