Seminarium philosophicum
A worked analysis beyond the introductory statement
Natural theology reaches a first cause with intellect, will, goodness and providence. It therefore removes the claim that revelation is impossible because no God exists or because God is an impersonal law. A rational Creator can know finite persons, act in history and communicate truth according to their mode of reception.
Possibility does not establish fact. One cannot infer from God's existence that a particular prophet, book or church is divine. The next stage studies motives of credibility: prophecy, miracle, holiness, coherence of the economy, public testimony and the historical persistence of the community claiming to receive revelation.
Revelation is fitting because human reason, though capable of truth, is slow, unequal and morally wounded. Truths naturally knowable about God would be reached by few, after long labour and mixed with error. Revelation proposes even these preambles with greater universality and certainty, while opening mysteries and a supernatural end inaccessible to natural discovery.
A divine message must be proportioned to both source and receiver. It cannot contradict first principles because the author of being is the author of reason. It may exceed comprehension, and it can be expressed in human language, history and institutions without becoming merely human. Incarnation is the supreme form of this condescension.
Public revelation differs from private revelation. The apostolic deposit binds the whole Church and is complete in Christ and the apostolic age. Later approved apparitions or locutions demand only prudent human faith according to evidence and never add a new article or correct the deposit.