Hello Tracy,
The 'I know' assertion is definitely his. I'm still torn on it: does it carry more weight because of connotations we attach to it or are we not speaking literally enough? In other words, is 'I know' supposed to be heard as 'I am certain' or can we skip that step? Either way, going around stating what we hold to be facts as belief seems to lessen one's view where others are concerned.
It's a concept I grapple with
