A disciple without intention is a lover without money; a traveller without knowledge is a bird without wings; a scholar without practice is a tree without fruit, and a devotee without science is a house without a door. The Qaroon (Korah) was revealed for the acquisition of a good character, not for chanting written chapters. A pious unlettered man is like one who travels on foot, whilst a negligent scholar is like a sleeping rider. A sinner who lifts his hands in supplication is better than a devotee who keeps them proudly on his head.
A good humoured and pleasant military officer
Is superior to a theologian who injures men.
One being asked what a learned man without practice resembled, replied: ‘A bee without honey.’
Say to the rude and unkind bee,
‘At least forbear to sting, if thou givest no honey.’
Saadi Shirazi
http://www.poemhunter.com/poem/ch-08-on-rules-for-conduct-in-life-maxim-50/