Because God said it, it is my word to you, when it come from the lord you have to trust it, believe it because God said, if you can't trust his word how is it you can trust his name, because with him he exult his very word above his name, when god says it, its a done thing you can say it, you can trust it, you can believe it, because what he's telling you its something that is already done. way should I go? because God says go he say go into all the world and preach (mark 16,15) why should I come? because god says come he says come unto me all he labor and heavy laden and I will give you rest (Matthew 11,28) why should I believe? because its impossible to pleased him with out faith (Hebrews 11,6) why should I trust him? because he said so, he said with all your hart trust him and acknowledge him in all your ways lean not on your own understanding and he will direct your path (proverbs 3,5,6) the word of god can stand on its own it doesn't need conformation or agreement or open-door it is strong by itself and it stand all by itself. its going to be hard for you to live a purposeful life it you cant trust the word of the Lord, all because god says it I believe him. The world of the lord will not return void, heaven and earth will pass away but word of the lord will remain forever (Matthew 24,35).Take the word of the lord , if he says it its already done right then there its done and its seal, do not take the word of the Lord slightly if he says so believe it, believe what He already pronounce over you.