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.
(..) put rancours in the vessel of my peace only for them. To make them kings, the seed of Banquo kings! What's to be done? Be innocent of the knowledge, dearest chuck, till thou applaud the deed. Full, full of scorpions, is my mind. Thou marvell'st at my words. Hold thee still. (..)2015 Macbeth
(..) (CHANTING IN GAELIC) "They met me in the day of success "and I have learned by the perfect'st report "they have more in them than mortal knowledge. "When I burned in desire to question them further, "they made themselves air into which they vanished. "Whiles I stood rapt in the wonder of it (..)2015 Macbeth