... quoting scripture or other spiritual authority in an argument.
Quoting for the sake of spiritual edification? Fine. Sunday school lessons, sacrament talks, random moments of emotional cheesiness, expression of personal opinion ... have at it.
Quoting to score points is simply lazy. And it kills the argument. Even if the other person disagrees with your interpretation of said quote, there's no point to discussing it. The fact that you Prophet-Slapped them tells them all they need to know: that you are not worth debating, because you are not planning to see someone else's side.
After all, you've apparently already got all the angels in heaven backing you up.