SHAFAQNA – Knowledge is meaningful when it is practiced and this will add credit to the world. Imam Ali (AS) said: A learned person without divine piety and compatible deeds is like a tree without fruits .
In another occasion, Imam Ali (AS) said: There is a mill in hell which is turning, do you not ask what it is milling? Imam (AS) was asked, what? Imam Ali (AS) replied: First a religious scholar who sinned and did not practice according to his knowledge .
 Nasaayeh, Page 252.
 As above, page 224.