Inhimthroughher, you said “Thomistic philosophy which is the tradition of the Church”. Thomism is not the only tradition within the Catholic faith, there are several other schools of thought which are just as valid.
While St. Thomas is not infallible the Church does not disagree with him and adopts his philosophy and theology as Her own; She does this with no other saint.
Many brilliant men have tried to deviate from St. Thomas and all have found themselves in grave error. What he teaches is not important because it is he who teaches but because what he taught is true; the Church has affirmed this.
Below are a few quotes taken from encyclicals ( the numbers prior to the quote are the paragraph numbers) along with the additional quotes and actions from Popes and the Church.
Aeterni Patris Leo XIII (This is such an important Encyclical that I summarized the whole thing. It sets up the need for philosophy then speaks of the importance of Thomas.)
1- Philosophy is important because the faithful can be easily led astray- and have their faith corrupted. The Church must do its best to protect the faithful and make sure philosophy is in accord with Church teaching.
2-the evil of false conclusions concerning divine and human things originates in bad schools of philosophy. This is the major problem of today, not understanding the relationship between the creature and the Creator.
Four ends of philosophy
4-Philosophy if used rightly made use of by the wise, in a certain way tends to smooth and fortify the road to true faith…( perfects Natural reason)
5-human reason finds the fullness of truth and faith in God-philosophy leads one to subject to theology.(comes to know there is a God and he should be believed)
6-Just as grace builds on nature Theology builds on philosophy- we need a strong foundation.(foundation for divine revelation)
7-Philosophy helps to defend divine truths and resist those who oppose them. The Church demands Christian teachers seek help from Philosophy.
8-No philosophical truth can be opposed to revealed doctrine.
9-Those who philosophize and unite with christian faith are philosophizing in the best possible way. Faith frees and saves reason from error. (Thomas did both philosophy and theology)
14- St. Thomas and Bonaventure and singled out as illustrious teachers. Set in order, clearly arranged and explained…
16-Scholasticism has a special office to bind together the human and divine science.
17-Among Scholastic Doctors St. Thomas “towers”. Thomas…is rightly and deservedly the special bulwark and glory of the catholic faith. Nothing is left wanting…
18-His philosophy contains the seeds of almost infinite truths. Thomas brought reason to its human height.
19-Nearly all founders and law givers of religious orders required Thomas. Including the Augustinians
21-Lists the recommendations of previous pope’s praising Thomas. One major one-Innocent VI -His teaching above all others, the canonical writings alone excepted, ……that those who hold it are never found swerving from the paths of truth and he who dare assail it will always be suspected of error.”
22-Ecumenical councils of Lyons, Florence, Vienna, and the Vatican used Thomas to combat greeks, heretics, and rationalists. Trent made it part of the order to lay upon the altar together with the sacred scriptures and decrees of the supreme pontiff the Summa. No other Dr. has ever shared this honor.
23-Heretics have declared that if the teaching of Thomas was taken away they would have succeeded.
24-It is thought hazardous if the special honor does not always and everywhere remain.
26-It is a first and cherished idea that the youth and furnished with education from Thomas.
27-Reasons why they want Thomas taught.- Give the youth and understanding and the ability to defend and promote the faith “Apart from the supernatural help of God, nothing is better calculated to heal those minds and bring them into favor with the Catholic faith that the solid doctrine of the fathers and Scholastics.”
28- “Domestic and civil society will be more peaceful and secure if the teachings are in conformity with Thomas.”
31-We exhort you venerable brethren to restore the wisdom of St. Thomas and to spread it far and wide for the defense and beauty of the catholic faith.” “ Let carefully selected teachers endeavor to implant the doctrine of Thomas Aquinas in the minds of students, and set forth clearly his solidarity and excellence over others.”
Canon Code of 1917 bound professors and students to study the teaching of Thomas. --Thomas had always been studied prior to this but was mandated because some were beginning to stray away from Thomas.
Garrigou Lagrange
The doctrine of St. Thomas on being, truth, and goodness, on the objective validity of first principles, which alone can lead to certitude of God’s existence.
By following Thomas alone can one reach the goal , thus indicated by the Vatican Council “finding God in nature…”
Following Thomas helps one to escape much floundering and fluxuation on the validity of reason on God one and triune, on the redemptive incarnation, the sacraments, on the last end, on human acts, on sin, on grace, virtues and gifts.”
These directing principles of thought and life become ever more necessary as the conditions of existence grow ever more difficult, demanding a certitude more firm, a faith more immoveable, a love of God more pure and strong.”
Doctoris Angelici
Pope Pius X June 29, 1914
Reaffirming Sacrorum Antistitum “Which required Scholastic Philosophy, having Thomas in mind particularly, to be taught in all seminaries and religious orders.”
Used the word particularly not exclusively-Thomas is the foundation and nothing that opposes his thought may be taught.
“The principles of philosophy laid down by St. Thomas Aquinas are to be religiously and unavoidably observed, because they are the means of acquiring such a knowledge of creation as is the most congruent with the faith.”
“The principles of St. Thomas, considered generally and as a whole, contain nothing but what the most eminent Doctors have discovered after much reflection…in regard to the particular reasons determining human knowledge , the nature of God and creation the moral order and ultimate end to be pursued.”
“If such principles are once removed or in any way impaired it must necessarily follow that students of the sacred sciences will ultimately fail to perceive so much as the meaning of the words in which the dogmas of divine revelation are proposed by the magistracy of the Church.
If the doctrine of any writer or saint has ever been approved by us or by our predecessors…it may easily be understood that it was commended to the extent that it agreed with the principles of Aquinas or was opposed to them in no way.
Quotes John XXII “ He (Aquinas) enlightened the Church more than all the other Doctors together; a man can derive more profit from his books in one year than a lifetime spent in pondering the philosophy of others.”
“It is of the first importance that the old system of lecturing on the actual text of the Summa Theologica-which never should have been allowed to fall into disuse-- be revived; for the reason also that the prelections on this book make it easier to understand and to illustrate the solemn decrees of the Church.”
Benedict XIV “Numerous Roman Pontiffs…have born glorious testimony to his philosophy. We also in the books we have written…have adhered and subscribed with joy and admiration to his philosophy, and confess that whatever good is found on Our own Writings is not in anyway attributed to us but entirely to so eminent a teacher.”
“For ever since the death of the Doctor, the Church has not held a single council but he has been present at it with all the wealth of his doctrine.”
Studiorum Ducem
Pope Pius XI
11-“We consider that Thomas should be called not only the Angelic, but also the common or Universal Doctor of the Church; for the Church has adopted his Philosophy as Her own, as innumerable documents of every kind attest.”
Humani Generis
17- when philosophy and terms become sloppy and inexact things start to fall apart
20(power of encyclicals)
31-Church demands Thomism, singularly pre-eminant.
32 -defends Thomism against those who attack it calling it “honored”
These are only a few of the quotes regarding St. Thomas. What he writes and says can often sound harsh or untrue but once explained makes perfect sense and one is not likely to disagree with it.