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.
(..) to keep us safe and they divided us into five groups, factions, The smart ones, the ones who value knowledge and logic They're all about kindness and harmony, always happy. They tell the truth, even when you wish they wouldn't. They're our protectors, (..)2014 Divergent