Hi, BettyRubble, that is not a quote from a Clint Eastwood movie, and I am quite sure it is not something Clint Eastwood said, even though you can find a lot of Internet sites where it is attributed to him.
It seems to be one of those clever sayings that get attributed to famous people over the years. With the help of a Google Books search, I can trace it back at least as far as 1969. Here is a screencap from
2000 One Liners by Larry Oliver, published in 1969:

Thanks for visiting the Clint Eastwood Web Board!
