I answered their questions 'to the best of my knowledge'. [=I gave the best answers I could based on what I knew, but I might have answered differently if I had known something else]
No one arrived late 'to my knowledge'. [=I am not aware that anyone arrived late, but it is possible that someone arrived late and I don't know about it]
They went on vacation, 'safe in the knowledge' that the farm would be well cared for while they were away.
(..) Me, Ruthie, Wilbur Freely... ...and the Price Brothers, Don and Zacky. And not one of us knew what was in store. It's common knowledge that most towns of a certain size have a witch... ...if only to eat misbehaving children... ...and the occasional puppy who wanders into her yard. (..)2003 Big Fish