I don't know, I don't care, and it doesn't make any difference!
I like to reminisce with people I don't know.
You've achieved success in your field when you don't know whether what you're doing is work or play.
I don't know the key to success, but the key to failure is trying to please everybody.
If life is just a stage, then we are all running around ad-libbing, with absolutely no clue what the plot is. Maybe that's why we don't know whether it's a comedy or tragedy.
I was gratified to be able to answer promptly. I said, "I don't know".
We all have possibilities we don't know about. We can do things we don't even dream we can do.
We're all lonely for something we don't know we're lonely for.
I refuse to answer that question on the grounds that I don't know the answer.
Science is what you know, philosophy is what you don't know.
My experience is that as soon as people are old enough to know better, they don't know anything at all.
1)I admit it, you are better than I am. 2)Then why are you smiling? 1)Because I know something you don't know. 2)And what is that? 1)I am not left handed.