"When the radius of knowledge expands, so does the circumference
 of ignorance." - Albert Einstein

"Use your gifts faithfully, and they shall be enlarged;
 practice what you know, and you shall attain to higher
 knowledge." - Matthew Arnold 

"Information is not knowledge.  Imagination is more important than knowledge.
 Knowledge is limited.  Imagination encircles the world." - Albert Einstein

"I have nothing at all against well-trained, knowledgeable Indian 
 technical support.  I hope to speak to one before I retire." --JW, ASR

"An investment in knowledge always pays the best interest." - Benjamin Franklin

"Those only who know little, can be said to know anything.
 The greater the knowledge the greater the doubt." - Johann Wolfgang von Goethe

"Knowledge can be communicated, but not wisdom." - Hermann Hesse

"Knowledge is of two kinds.  We know a subject ourselves, or we
 know where we can find information upon it." - Samuel Johnson

"To know that we know what we know, and that we do not know what
 we do not know, that is true knowledge." - Henry David Thoreau

"The greatest enemy of knowledge is not ignorance,
 it is the illusion of knowledge." - Stephen Hawking