be not to know

be not to know

To not have been able to know something in advance. We aren't to know the path that life will take us on.
See also: know, not

be not to ˈknow

have no way of realizing or being aware that you have done something wrong: ‘I’m sorry I called when you were asleep.’ ‘Don’t worry — you weren’t to know.’
See also: know, not