"...We must confess, on the authority of the Bible itself, that all knowledge of religion is from God, and not only that which the Bible has transmitted to us. There never was a time when God had not spoken to man, and told him to a certain extent his duty. His injunctions to Noah, the common father of all mankind, is the first recorded fact of the sacred history after the deluge. Accordingly, we are expressly told in the New Testament, that at no time He left Himself without witness in the world, and that in every nation He accepts those who fear and obey Him. It would seem, then, that there is something true and divinely revealed, in every religion all over the earth...
The word and the Sacraments are the charac*teristic of the elect people of God; but all men have had more or less the guidance of Tradition, in addition to those internal notions of right and wrong which the Spirit has put into the heart of each individual.
This vague and uncertain family of religious truths, originally from God, but sojourning without the sanction of miracle, or a definite home, as pilgrims up and down the world, and discernible...may be called the Dispensation of Paganism, after the example of the learned Father already quoted. And further, Scripture gives us reason to believe that the traditions, thus originally delivered to mankind at large, have been secretly reanimated and enforced by new communications from the unseen world...
Accordingly, there is nothing unreasonable in the notion, that there may have been heathen poets and sages, or sibyls again, in a certain extent divinely illuminated, and organs through whom religious and moral truth was conveyed to their countrymen...
These were based on the mystical or sacramental principle, and spoke of the various Economies or Dispensations of the Eternal. I understood these passages to mean that the exterior world, physical and historical, was but the manifestation to our senses of realities greater than itself. Nature was a parable: Scripture was an allegory: pagan literature, philosophy, and mythology, properly understood, were but a preparation for the Gospel. The Greek poets and sages were in a certain sense prophets; for "thoughts beyond their thought to those high bards were given." There had been a directly divine dispensation granted to the Jews; but there had been in some sense a dispensation carried on in favour of the Gentiles...
The process of change had been slow; it had been done not rashly, but by rule and measure, at sundry times and in divers manners...As far as we know, there never was a time when...revelation was not a revelation continuous and systematic, with distinct representatives and an orderly succession..."
- Blessed John Henry Newman (circa. 1845-65), cardinal & theologian of the Catholic Church