doctrines of faith are conclusions incorrectly derived from the first and self-evident principles embedded in [rational human] nature. Such conclusions do not have the force of demonstration; they are arguments that are either probable or sophistical [fallacious]. And so there exists the possibility to answer them. In other words, every possible argument against every Christian doctrine has a rational mistake in it somewhere and therefore can be answered by reason alone. If this were not so, if Aquinas