Quotes from authors passed in 1990
What's an expert? I read somewhere, that the more a man knows, the more he knows, he doesn't know. So I suppose one definition of an expert would be someone who doesn't admit out loud that he knows enough about a subject to know he doesn't really know how much.
Malcolm Forbes
Victory is sweetest when you've known defeat.
Malcolm Forbes
Education's purpose is to replace an empty mind with an open one.
Malcolm Forbes
A man doesn't know what he knows until he knows what he doesn't know.
Laurence J. Peter
Being right half the time beats being half-right all the time.
Malcolm Forbes
Donna Leon 
Mikhail Lermontov 
Sally Kellerman 
Barbara Stanwyck 
Herbert Baxter Adams 
Jim Dine 
Henry Clay 
Thomas Carlyle