Aeterni Patris

http://www.archive.org/details/AeterniPatris
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the supreme pastors of the Church have always thought it their duty to advance, by every means in their power, science truly so called, and at the same time to provide with special care that all studies should accord with the Catholic faith, especially philosophy, on which a right interpretation of the other sciences in great part depends.
that false conclusions concerning divine and human things, which originated in the schools of philosophy, have now crept into all the orders of the State, and have been accepted by the common consent of the masses. 3. Therefore, Divine Providence itself requires that, in calling back the people to the paths of faith and salvation, advantage should be taken of human science also-an approved and wise practice which history testifies was observed by the most illustrious Fathers of the Church.
Philosophy…a steppingstone to the Christian faith,(6) sometimes the prelude and help of Christianity, sometimes the Gospel teacher
it is most fitting to turn these truths, which have been discovered by the pagan sages even, to the use and purposes of revealed doctrine, in order to show that both human wisdom and the very testimony of our adversaries serve to support the Christian faith-a method which is not of recent introduction, but of established use, and has often been adopted by the holy Fathers of the Church.
But if natural reason first sowed this rich field of doctrine before it was rendered fruitful by the power of Christ, it must assuredly become more prolific after the grace of the Saviour has renewed and added to the native faculties of the human mind. And who does not see that a plain and easy road is opened up to faith by such a method of philosophic study?
Therefore in this also let us follow the example of the Angelic Doctor, who never gave himself to reading or writing without first begging the blessing of God, who modestly confessed that whatever he knew he had acquired not so much by his own study and labor as by the divine gift; and therefore let us all, in humble and united prayer, beseech God to send forth the spirit of knowledge and of understanding to the children of the Church and open their senses for the understanding of wisdom. And that we may receive fuller fruits of the divine goodness, offer up to God the most efficacious patronage of the Blessed Virgin Mary, who is called the seat of wisdom; having at the same time as advocates St. Joseph, the most chaste spouse of the Virgin, and Peter and Paul, the chiefs of the Apostles, whose truth renewed the earth which had fallen under the impure blight of error, filling it with the light of heavenly wisdom.