It would be like going to a doctor who gives a diagnosis, treats you, then doesn't bother to ask, "are you feeling better now". Your answer, yes or no, is a testimony of whether it works or not.
When doctors stop accepting our testimonies, we are in trouble.
I had a doctor do that once. Ever since I was a young adult he told me it was all in my head. I believed him because he was "THE DOCTOR", but his lack of belief in my awareness of my body ended in surgery....surgery, I would not had if he would have believed me early on.
I'm sure my doctor would say he didn't call me a liar, but his actions and lack of belief in what I said, sure did.