The topic of insanity or madness is an issue which has a direct relation with the life of people. Many scholars has tackled this issue in details. In my current research, I discussed the speeches of both teams and their evidences in a scientific manner depending  on  clear and correct prophetic traditions  in addition to mental evidences .I mentioned all that in six chapters in which I tackled the acts of Satan on the light of Quran's verses, Satan insanity, those who proved the insanity and their evidences, dissenters and their evidences and then I stated the correct speech and its evidences. I also evidences such as "Those who eat Riba (usury) will not stand (on the Day of Resurrection) except like the standing of a person beaten by Shaitan (Satan) leading him to insanity" and "who mischief  whispers into the hearts of Mankind" and the prophetic tradition "Every newborn from the descendants of Adam is touched by Satan when born"; The Prophet said, “Verily, Satan flows through the human being like blood". I later discussed the mental evidences and responded some on 10 aspects such as: no mental objection from the occurrence of insanity  and the evidence of trustees, insanity curers and scholars, their evidences based on the speech of Satan on behalf of the insane and his /her bearing for beatings and the knowledge of insane for some secrets. At the end of research, I concluded a scientific theory that confirms the relation between Satan and Man and concluded my study with results and recommendations.