Audi, vide, tace, si tu vis vivere. -- "Hear, see, be silent, if you [wish] to be alive ."
Audiatur et altera pars. -- "The other part should be heard, too."
Auri sacra fames. -- "The accursed hunger for gold." (Vergil, Aeneis 3,57; later quoted by Senecaquod non mortalia pectora coges, auri sacra fames -- "What aren't you able to bring men to do, miserable hunger for gold!")
Manus manum lavat. -- "One hand washes the other."
Medicus curat, natura sanat. -- "The doctor cares [for his patient], nature heals [him]."
Memento mori. -- "Remember your mortality." Also, ironically, "Remember to die." it is the motto of the Friars of Trappa.
Mens sana in corpore sano. -- "A healthy spirit in a healthy body." (This quotation is out of context: As quoted here, it appears to say that a healthy body is the prerequisite for a healthy spirit, but that's not how it was meant initially. The complete quote is Orandum est ut sit mens sana in corpore sano, which means "Let's hope that there is a healthy spirit in a healthy body."; Juvenal, Satires 10, 356)
Morituri te salutant -- "Those who are doomed to die greet you" (traditional greeting of the gladiators prior to battle; passed on by Suetonius, Claudius 21)