evidence: Reiterated in many sources including a 2005 TV ad by Lockheed Martin. A marketing pitch that was dressed up as a Churchill quote. [...] No attribution found. Here is a substitute, not an original Churchill quote (it’s from Longfellow, "The Ladder of St. Augustine," stanza 10); but frequently repeated both by WSC and his son Randolph: [...] Specifically denied by WSC. An old naval saw.