Knowledge is knowing as little as possible
Charles Bukowski
To know that you do not know is the best. To pretend to know when you do not know is disease.
Lao Tzu
Nothing is more conducive to peace of mind than not having any opinion at all.
G. C. Lichtenberg
It is the tragedy of the world that no one knows what he doesn't know; and the less a man knows, the more sure he is that he knows everything.
Joyce Cary