God has said that his word will not return to him unless they have served its course.
For heaven an earth will pass away but the words of God remains thesame.
Reminding God of his promises during prayer is a clear evidennce to God that you know your right.And by so you are tasking God to keep to his words.And he can not betray himself.
So read the bible so you can be well grounded on the privilleages you have in God