“Because, as a man ought to obey a lower power in those things only which are not opposed to the higher power; so even a man ought to adapt himself to the rule in all things according to its mode; on the other hand, a man ought to adapt himself to the secondary rule in those things which are not at variance with the primary rule: because in those matters in which it is at variance, it is not a rule:
On that account, one is not to give assent to the preaching of a prelate which is contrary to the faith since in this it is discordant with the primary rule. Nor through ignorance is a subject excused from the whole: since the habit of faith causes an inclination to the contrary, since it teaches necessarily of all things that pertain to salvation.”1
St. Thomas on what to do if a member of the magisterium errs
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