With respect to authority, much is said that Protestants rely on their own personal interpretation of Scripture.
True.
However, that is exactly what Catholics must do establish the authority of the Church they rely on. How do you know the Church has the authority it claims without you interpreting passages like Matthew 16:18-19. So it rests on your opinion. Your opinion may be influenced by what the Catholic Church says but you must still make a conclusion on your own. Otherwise it would be the Church saying it has authority simply because it says it does.You get into a circular argument.
There’s a big difference.
First of all, the Protestant version is circular. The Catholic is not. Let me explain.
a. A Protestant says, “The Bible alone says so.” That is circular. Only one authoritative source is relied upon. In essence, that authority is the person interpreting the Scripture. Yourself. Because Scripture can’t tell you if you are wrong.
b. A Catholic says, “It has been taught by the Church, in Sacred Tradition and Scripture, from the time of the Apostles.” Note the many sources of evidence referenced.
i. The Church is a reference to the centuries worth of Teaching from eminent Theologists and Authorities in the Church who have written about the Doctrines of Christ through the centuries. Guided by the Holy Spirit, they take us deeper into the Teachings of Christ.
ii. Sacred Tradition is a reference to the Teachings of Jesus Christ which preceded the New Testament. In fact, the New Testament is written based upon these Commandments of Christ.
iii. And then there’s Scripture. The Catholic Church is the source of the New Testament Scripture and She it is who put the Bible together and ensures that it is interpreted consistently, expressing a message consistent with the Traditions passed down by Jesus Christ.
Second of all, the Protestant version is an example of self-pride. Protestants will not accept anything they can’t understand themselves.
Whereas, Catholics accept the authority of Christ through the Church and will not place their own understanding over that taught by the Church which Scripture describes as the Teacher of the Wisdom of God (Eph 3:10).
I hope that helps.