Aequam memento rebus in arduis
servare mentem.
Notes from Wikiquote
Book II, ode iii, line 1
To flee vice is the beginning of virtue, and to have got rid of folly is the beginning of wisdom.
The mountains will be in labor, and a ridiculous mouse will be brought forth.
Quote text and notes from Wikiquote: Horace (page history), available under CC BY-SA 4.0. Source quality and labels are our own summary of what Wikiquote records.