SHAFAQNA – In a Divine Narration, Allah (SWT) revealed to the Prophet of Islam (PBUH): O’ Ahmad, If God’s servant controls his/her diet (eats just enough) and protects his/her tongue, I will teach them wisdom. If he/she is a disbeliever (Kafir), his/her wisdom will be proof against him/her and weight for him/her to bear; and if he/she is a believer, his/her wisdom will be light and proof and cure and blessing for him/her. Therefore, will know about things which he/she did not know about them, and will see what he/she could not see. The first thing which I will show to him/her is their own faults, in order that they do not go after finding faults of others, and will show to them the delicateness of knowledge in order that Satan cannot enter him/her .
 Beharul Anwaar, Vol. 74, Page 28.