It's a "refran," an old saying. "He who knows [how] to work knows [how] to rest."
Do you know who I am?
It means Who knows
Quien Sabe........JajajajaQuien Sabe........Jajajaja
It means: "who knows the best if..."
quien sabe
who knows the future
"She knows who you are"
Quien Sabe means "Who knows?"
quien sabe!
"But you never know who's watching"
Quien sabe
RPM Miami - 2011 Nadie sabe para quien trabaja Nobody Know Who He Works For 1-4 was released on: USA: 22 May 2011