Yevgeny Zamyatin said this quote
“ Do you believe that you will die? Yes man is mortal I am a man ergo... no that isn't what I mean. I know that you know that. What I am asking is, have you ever actually believed it? Believed it completely? Believed not with your mind but with your body? Actually felt that one the fingers now holding this very piece of paper will be icy and yellow? No, of course you don't believe it. Which is the reason why up until now you haven't jumped from the tenth floor to the pavement. ”