Seeking What You Do Bot Know
Once Ibrahim bin Adham saw a stone with the inscription, 
"Turn me over and read!" 
   When he did an inscription appeared: 
"You do not practice what you know. 
   Why do you seek what you do not know?"
 
-Al-Hujwiri [may Allah be pleased with him], "Kashf al-Mahjub"
  
 -Al-Hujwiri [may Allah be pleased with him], "Kashf al-Mahjub"

