"Fear is often preceded by  astonishment, and is so far akin to it, that both lead to the senses of  sight and hearing being instantly aroused. In both cases the eyes and  mouth are widely opened, and the eyebrows raised. The frightened man at  first stands like a statue motionless and breathless, or crouches down  as if instinctively to escape observation. The heart beats quickly and  violently, so that it palpitates or knocks against the ribs... That the  skin is much affected under the sense of great fear, we see in the  marvelous manner in which perspiration immediately exudes from it... The  hairs also on the skin stand erect; and the superficial muscles shiver.  In connection with the disturbed action of the heart, the breathing is  hurried. The salivary glands act imperfectly; the mouth becomes dry, and  is often opened and shut."
charles darwin
"For  to fear death, my friends, is only to think ourselves wise without  really being wise, for it is to think that we know what we do not know.  For no one knows whether death may not be the greatest good that can  happen to man. But men fear it as if they knew quite well that it was  the greatest of evils. "
socrates
"Men fear death as children fear to go in the dark; and as that natural fear in children is increased by tales, so is the other."
Francis Bacon  
"The  only thing we have to fear is fear itself -- nameless, unreasoning,  unjustified terror which paralyzes needed efforts to convert retreat  into advance."
Franklin.d. roosevelt 
"Just as courage imperils life, fear protects it."
Leonardo Da vinci 
"I have, indeed, no abhorrence of danger, except in its absolute effect - in terror. "
Edgar Allen Poe
"Terror is the feeling which arrest the mind in the presence of whatsover is grave and constant in human sufferings and unites it with cause. "
James Joyce 
 
