before just saying "hopeless"

Abraham was first named "father" and then became a father

because he dared to trust God to do what only God could do: 

raise the dead to life, with a word make something out of nonthing. 

when everything was hopeless, Abraham believed anyway, 

deciding to live not on the basis of what he saw he couldn't do but on what God said He would do. 

(Romans 4: 17-18, the Message)

obviously, long time ago, He promised something...  i couldn't understand what it was exactly though.... 

but no matter what it is (and, it wouldn't matter), now it is hopeless.... yes... everything is hopeless... 

can i belive anyway? 

deciding to live not on what i saw i can't do but on what He would do?

how? HOW???????????????????????