I lead a certain kind of life; I think in a certain pattern; I have certain beliefs and dogmas and I don’t want those patterns of existence be disturbed because I have my roots in them.  I don’t want them to be disturbed because the disturbance produces a state of unknowing and I dislike that.  If I am torn away from everything I now and believe, I want to be reasonably certain of the state of things to which I am going.  So the brain cells have created a pattern and those brain cells refuse to create another pattern which may be uncertain.  The movement from certainty to uncertainty is what I call FEAR