According to the pope, we should …

After reconstruction, we can see that the conclusion is cited in the premise, so the argument form is delta (q is A because q is Z): “… (q) is acceptable (A) because we only use 10% of our brains (q) is said by Einstein (Z)”.
The premise contains a reference to a third party, so the argument substance is ‘III’: “… because … is said by … (III)”.
The keyword MORALLY AUTHORITATIVE describes the relationship between predicates Z and A. The argument lever can thus be formulated as “Being said by … (Z) is MORALLY AUTHORITATIVE for being acceptable (A)”.
Source
Other examples
Notes
The argument from expert opinion, argument from testimony, argument from moral authority, and argumentum ad populum are all specific forms of what is traditionally known as the ‘argument from authority’. The first three types involve qualitative authority: epistemic authority (someone with the right knowledge), situational authority (someone in a position to know), and deontic authority (someone with proper moral authority). The argumentum ad populum, however, relies on quantitative authority. In practice, mixed variants can occur, such as when an argument is endorsed by “the majority of economic experts in the country”.
