Sentence:  Even if that 's all the promise he ever gave or ever will give , the giving of it once was enough and you believed it then and you will always believe it , even when it is finally the only thing in the world you <WSD>have</WSD> left to believe , and the whole world is telling you that one was a lie . 
Meaning of the word marked with <WSD> tags:  have or possess, either in a concrete or an abstract sense