Ibn ul Jawzî – Sayd Al-Khâtir 138:
“… guiding people by one’s action is more inspiring than doing so by words. One should implement what he knows for it is indeed the greatest foundation.
And the miskîn, the true miskîn is the one who wasted his life learning what he does not practice, thus he loses the pleasures of the dunyah and the goodies of the âkhirah, (in addition to) coming forth bankrupt (on the day of judgment) with strong evidences against himself.”