A tree is useless if
its fruits are not fit to eat
The beautiful flowers in the garden
Are monotonous if they are without fragrance
The dark vapour laden clouds seem to be a mirage
If they pass without rain
Likewise a preacher without practice is worthless
What is the use of of being learned
If his knowledge is devoid of practice?
It will never benefit the people.

Mohammad Akmal Nazir

http://www.poemhunter.com/poem/a-preacher-without-practice/