How Do I Know that Prayer Works?

Okay. I've about had it with a certain circular conversation. It goes something like this:

Them: I just hate thing X about my life, and I feel absolutely powerless to change it. Nothing works.

Me: What have you tried so far?

T: Complaining, talking to a friend, coming to see you.

M: What does your spiritual practice look like around this issue?

T: Oh, well, I just basically walk around in a spiritual energy all the time.

M: So, do you spend any time in specific dedicated spiritual practice?

T: Not really, no. I don't see the point. I'm a spiritual being all the time and I don't need a special time or state to prove that.

M: So you haven't prayed about this issue?

T: No.

M: Why not?

T: I don't really see why it would work. I don't really believe God answers my prayers.

M: What makes you fee that way?

T: I don't have any evidence. What evidence can you show me that prayer changes anything?

M: My personal evidence is that changes that I experience after I pray.

T: Yeah, I don't have any of that.

M: Why do you suppose that is?

T: Because prayer doesn't work.

M: You mean, the prayer that you aren't doing?

T: Why would I do it if it doesn't work?