No more than we know whereabouts it is in your head.
You want security that "protects" your documents contents from yourself but can still be cracked.
Interesting! What kind of security do you see that as providing?
btw You didn't give yourself a hint?
Was the password omniscient or prescient by chance?
Do you pick passwords associated with places, things, people, dates, or an amalgam of two different terms? You subconscious is already working to solve this puzzle if you stop thinking about it for awhile.