Three real life scenarios that are all the exact same thing.
First: A high school teacher who has her own shortcomings gives one of her students a retest... and another... and so on. She believes this student is capable of more and she wont stop giving him chances until he either passes or he gives up. As a student, you're sick of working towards it.... you actually want her to quit giving you chances so you can just take the failing grade and move on.
Second: When the issues started arising with Tiff I started having a really hard time trusting her but yet I believed that she had it in her to be honest .... So while I may have known something I still asked her the question.... I wanted her to tell me the truth so that I could reaffirm the belief that she had an honest heart. I wanted to hear the truth so that I could begin trusting her again.... but every lie -- even the little "white" ones just frustrated both of us in the long run. I was a person who had alot of his own problems but had a belief about someone and put faith in someone doing the right thing. Ultimately, I was let down when Tiff gave up and felt more comfortable lying than actually caring about the truth.
Those are just faliable humans having faith in another faliable human.... but the third is how God feels about us. He knows us and knows what we are capable of and He gives us retest after retest until we pass. The same way that the student became annoyed by the teacher and Tiff became annoyed by me, we often become annoyed with God. But see, God is not faliable. And to think that He still believes we are capable of something great is pretty incredible.