Truer words were never spoken.
4 seconds sound clip from Batman (1966) - Hot Off the Griddle (S2E3) TV Series.
You can hear this line at 00:11:34 in the Blu-ray version of the movie.
Quote context
[...]
- How thoughtful, but we must be gone. Crime waits for no one.
- As they say, an army travels on its stomach.
- Indeed, sir. Uh, I anticipated your haste. I provided this sack.
- It's always been my motto: be prepared.
- Truer words were never spoken.
- And if I may say so, sir, where are you off to?
- The Gotham City Natural History Museum.
- And we must get there pronto before Catwoman.
- If my calculations are correct...
- Someone should be coming through that window within the next 6 seconds.
[...]