“To be conscious that you are ignorant is a great step to knowledge.”
“There is much pleasure to be gained from useless knowledge.”
“When you know a thing, to hold that you know it; and when you do not know a thing, to allow that you do not know it – this is knowledge.”
“The beginning of knowledge is the discovery of something we do not understand.”
“One’s first step in wisdom is to question everything – and one’s last is to come to terms with everything.”
First Principles 
“There is much pleasure to be gained from useless knowledge.”
I wonder how English (or, for that matter, language as such) allowed for contradiction, like much else. 🙂
P.S. Well, one can escape the contradiction by defining “use” to not include “pleasure”