""Gaat u maar rustig slapen." (Just go to sleep peacefully) - According to popular belief, prime minister Hendrikus Colijn said these words in a radio speech on the eve on the German invasion of the Netherlands in 1940. In reality, Colijn was not prime minister anymore by then. The phrase refers to a radio speech by Colijn in March 1936 in which he reacted on the remilitarization of the Rhineland. In this speech Colijn said: Ik verzoek den luisteraars dan ook om, wanneer zij straks hunne legersteden opzoeken, even rustig te gaan slapen als zij ook andere nachten doen. Er is voorshands geen enkele reden om ongerust te zijn. (That is why I would like to ask the listeners to sleep as tranquilly as they do on other nights, when they turn into their beds shortly. For the moment there is no reason whatsoever to be alarmed)"
January 1, 1970
https://en.wikiquote.org/wiki/List_of_political_catchphrases