We have the ancient Roman writer Vegetius to thank for the phrase: "If you want peace, prepare for war." The phrase itself was adapted from one found in Vegetius' book on Roman military strategy, De Re Militari (circa 450 AD), the only complete work on the topic to survive to the modern era. The phrase translated literally reads, "Therefore let him who desires peace prepare for war."
Whether that is good advice seems less relevant than whether those who prepare for war actually desire peace. I am thinking of something Madeleine Albright, secretary of state under President Bill Clinton, said to Colin Powell, the then chairman of the Joint Chiefs of Staff, to wit: "What's the point of having this superb military that you're always talking about if we can't use it?"
Which brings us to today: a world decidedly more under the sway of Albright than Vegetius, a world in which everyone seems to be preparing for war, but with little intention of preserving the peace.