In fact, everything we encounter in this world with our six senses is an inkblot test. You see what you are thinking and feeling, seldom what you are looking at. (Shiqin, in A View on Buddhism)
I’m having a conversation with someone; they’re talking … and I’m listening.
What am I listening for? … Very likely, my next opportunity to speak. And if that’s the case, I’m not really listening to what is being said; I’m listening to my own assessments, anecdotes and opinions.
There’s a Zen saying … I don’t learn much with my mouth open (or words to that effect). It fits quite well with “Don’t know”.
PS: Do not seek the truth. Only cease to cherish opinions. (Seng-ts’an)