Is this part of the reason why MORMONS don't talk about what happens in the temple? (verse 7)?

That's a good question. I don't remember ever reading that page, or maybe I've read it and I just didn't really understand it. I would have to agree with you. It must be part of the reason. Things of God are sacred, and we must keep them that way. Thanks for sharing this scripture with us. It has certainly helped give me more confirmation of the Gospel of Jesus Christ.