We are all born ignorant; but one must work hard to remain stupid.
Real knowledge is to know the extent of one's ignorance.
To know what you know and what you do not know; that is true knowledge.
Knowledge has to be improved; challenged; and increased constantly; or it vanishes.
To know that we know what we know; and to know that we do not know what we do not know; that is true knowledge.
Wisdom consists not so much in knowing what to do in the ultimate as knowing what to do next.
By: Herbert Hoover
Ralph Waldo Emerson
P. J. O'Rourke
Henry David Thoreau
George Bernard Shaw