I am not a great theologian. I know there is a theological concept called invincible ignorance in which a strong enough faith binds you to any facts to the contrary.
The investigator should have a robust faith – and yet not believe.
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Purity is not imposed upon us as though it were a kind of punishment it is one of those mysterious but obvious conditions of that supernatural knowledge of ourselves in the Divine which we speak of as faith. Impurity does not destroy this knowledge it slays our need for it.