Quotes from Qur'aan, Sunnah & the People of Knowledge in Islam
It is reported that Sufyân Al-Thawrî – Allâh have mercy on him – said,
“Wealth is the disease of this Ummah, and the scholar is the doctor of this Ummah. So if the doctor brings the disease to himself, how will he cure the people?”
Al-Dhahabî, Siyar A’lâm Al-Nubalâ`, Vol. 7 p243.
Abu Al-Hasan Ali bin Ahmad said:
“Deal with optional acts of worship as if they are obligatory, and acts of disobedience as if they are kufr (disbelief), and your desires as if they are poison, and socializing with the people as if it were fire, and nurturing of your soul as if it were medicine.”
Khilasat Al-Athaar, 3/401
Daily Islamic Benefits 