Abu Hurairah told that the Messenger of Allah (saas) said:
'Allahumma! Inni a'udhu bika minal-arba': min 'ilmin la yanfa'u, wa min qalbin la yakhsha'u, wa min nafsin la tashba'u, wa min du'a'in la yusma' [O Allah, I seek refuge with You from four things: From knowledge that is of no benefit, from a heart that does not fear (You), from a soul that is never satisfied, and from a supplication that is not heard].'"