Have you heard of this new thing called the internet? It's giving people new expectations. It's allowing them to become their own expert. Knowledge lies anxious at their fingertips. Gloss over the truth in your advertising and you'll quickly be dismissed as a poser.
I think it's a mistake to treat different realms of knowledge as if they are some how fundamentally the same.
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In order to the existence of such a ministry in the Church there is requisite an authority received from God and consequently power and knowledge imparted from God for the exercise of such ministry and where a man possesses these although the bis.