Linguistics

i was reading a book this week that was talking about the word 'sincerely', it was extremely interesting. so sincere, comes from Latin 'sine' 'cera' which means without wax. apparently when sculptors of the Renaissance would make a mistake in a sculpture, they would hide the mistake with a combination of wax and stone dust. when a sculpture was sincere it was without wax, it was 'true' so to speak. so when we sign our letter sincerely we mean truthfully. i thought that was interesting. know any other history of the spoken word?