'Ain al-Iman, the fourth stage of belief, is a belief of conviction; not only reason, but every part of one's being is convinced and assured of the truth of things, and nothing on earth can change it. If a person were to say to him, "Do not cross over this place, there is water here," he will say, "No, it is land, I can see for myself." It is just like seeing with the eyes all that one believes. This belief is the belief of the seer whose knowledge is his eyewitness, and therefore his belief will last for ever and ever.