Before revision: The phrase is adapted from a statement found in Latin author Publius Flavius Vegetius Renatus's tract Dē Rē Mīlitārī (fourth or fifth century AD), in which the actual phrasing is Igitur quī dēsīderat pācem, præparet bellum ("Therefore let him who desires peace prepare for war.").
After revision: The phrase is adapted from a statement found in Roman author Publius Flavius Vegetius Renatus's tract Dē Rē Mīlitārī (fourth or fifth century AD), in which the actual phrasing is Igitur quī dēsīderat pācem, præparet bellum ("Therefore let him who desires peace prepare for war.").