Belief is something you have in something if you have insufficient evidence but still think it is so.
i.e.
I believe my wife is upstairs
(goes and has a look)
Yep she's upstairs, now I know my wife is upstairs.
i.e.
I believe my wife is upstairs
(goes and has a look)
Yep she's upstairs, now I know my wife is upstairs.
You can fix ignorance, you can't fix stupid.
Tinkety Tonk and down with the Nazis.