Because it's related to the mountain statement directly. It helps to understand it. I wouldn't have said it otherwise. You're talking Jesus so surely other things stated about Jesus are relevant. Fair enough if I started talking to you about fried worms - but I didn't. I kept precisely on subject.
It's what he's saying.. directly. You're going on about literally moving mountains - that is completely missing the point. He embodies 100% faith. So he = the mover of mountains. We (Christians) aspire to this. He points out our weakness. Where's the problem???
It's what he's saying.. directly. You're going on about literally moving mountains - that is completely missing the point. He embodies 100% faith. So he = the mover of mountains. We (Christians) aspire to this. He points out our weakness. Where's the problem???