Pieper 1:107-8: If the term “science” denotes a certain knowledge, in opposition to mere opinions, views, hypotheses, etc., theology is the perfect science, the only reliable science on earth. All other sciences are based on human observations and human deductions, and in the nature of the case—errare humanum est—the information offered by philosophy, astronomy, medical science, etc., is more or less unreliable. But the Christian theologian gets his information from the Bible, which is God’s Word, the depository of God’s own observation, opinion, and doctrine. Such a science cannot contain any error—errare in Deum non cadit—and cannot give any unreliable information (John 17:17: “Thy Word is truth”; John 10:35: “The Scripture cannot be broken”).
Pieper I.110 (on what I would call the “pretended neutrality fallacy”): A word on the rational proofs for the Christian religion, as employed in apologetics. The Christian apologist is in a position to show any rational man, particularly if he have a well-trained mind, that after all it would appear more reasonable to accept the claims of Christianity as true than to reject them as false. But he must ever keep in mind that his real business is not to demonstrate the truth of the Christian religion to the unbeliever, but to uncover the insincerity of unbelief, for all who reject Christianity do so, consciously or unconscionsly, because of their evil will and not because of their pretended “intellectual honesty.” So Christ declares: “Men loved darkness rather than light…. Everyone that doeth evil hateth the light, neither cometh to the light, lest his deeds should be reproved” (John 3:19–20). There are no scientific reasons or rational proofs against the truths of Christianity.