How to Talk to a Heretic (If You Must)*
"It is to be noted that the heretics, being unable to vindicate themselves against the truth of the faith by force, by arguments, or by authorities, in consequence immediately fall back upon verbal sophisms, ambiguities, and evasions in order to avoid being entrapped in their errors. The use of ambiguous replies is one plain sign by which heretics can be recognized. One kind of deception which they use is equivocation. For instance, when asked if they believe in the sacraments of baptism, the Eucharist, penance, matrimony, ordination, and extreme unction, they reply that they do indeed believe, but what they mean by all this is either good will in the heart or an inner penance. Likewise, they may take 'the true body of Christ' to mean His mystical body, the Church, or the body of any good man, which they say belongs to Christ, as do other bodies also. So, when asked whether they believe in the body of Christ, they reply ambiguously or with a double meaning....