Yeah that was one of those quotes that someone else had sent to me and I remembered it when I read the OP. I did a search but couldn't come up with any sources

Yeah that was one of those quotes that someone else had sent to me and I remembered it when I read the OP. I did a search but couldn't come up with any sources. But the other part of the quote is this: "Success is not final, failure is not fatal. It’s the tenacity and courage to continue that counts." And that seems to come up quite a bit as being attributed to Churchill.