The y in that is the supernatural stuff - the story. I wouldn't go to see a movie if it didn't have a good story. I wouldn't go if it was just a list of facts. But that's what the dull modern atheists types want me to do in life.
For example, take a thing Mormons are commonly known for—not drinking alcohol. It came about in what we call the 'word of wisdom' [1] [2].
s := The story part would be "In consequence of evils and designs which do and will exist in the hearts of conspiring men in the last days, I have warned you, and forewarn you, by giving unto you this word of wisdom by revelation—"
x := don't drink (and other health related things like eating meat sparingly)
y := to be healthy in both body and mind/spirit
z := I have faith (faith is effectively trust in someone who has shown that they're trustworthy) in God
[1] https://www.lds.org/scriptures/dc-testament/dc/89?lang=eng
[2] https://www.lds.org/topics/word-of-wisdom?lang=eng&old=true