I heard from members of the Imam’s household that he had said in his private meetings that, “I have never known a phenomenon such as fear and don’t know what it is to fear meaning that what happens to a person when he is overcome with fear.” From the medical viewpoint, we got this impression from the Imam that fear was basically alien to the Imam because when a person is overcome with fear a substance known as adrenalin is secreted and this substance is responsible for the external signs at the time of fear meaning that it causes heartbeat to increase; the color of the skin to pale; the body to tremble and get agitated; to raise blood pressure and create an undesirable condition in the person. We who for the past eight or nine years were monitoring the pulse rate of the Imam, checking his blood pressure and even of late monitoring his heart by means of the television screen or telemonitor while we could check his heartbeat minute-by-minute and see the heartbeat of the Imam with our own eyes throughout his period when a lot of unsavory incidents had occurred that must normally at least raise the heartbeat, yet we never saw the heartbeat rate of the Imam increase in relation to the flood of incidents and difficulties.[1]
[1]I don’t know what it is to fear: Dr. Pur-Muqaddas