Fear is very powerful emotion & can cause extreme stress.Fear of the unknown for e.g.travelling alone through a dense forest at night or passing by a cemetery at night tends to give goose flesh because of negative thoughts that come in that environment in reality nothing may happen.Fear of uncertainy is as powerful.The wife is in labor-pain & a caesarian has to be performed.The uncertainty of the outcome causes major stress to the husband pacing up & down the hospital corridor.Another situation is when an individual takes up a new job & on the first day is uncertain of his behaviourwhich would bring him success.To cope with fear the mechanisms most suitable are faith in HIM & retionalising the situaltion.