anyway what is the Roman Catholic explanation for this verse, and how do catholics follow this teaching of jesus? looks like this teaching holds no meaning to catholics.
First, the ENTIRE deposit of Faith (written and spoken word) is of utmost importance to Catholics.
Catholics do what Jesus said to do. The Bible says that the Church, not the Scriptures, is the pinnacle and foundation of the truth (1 Tim. 3:15) and the final arbiter on questions of the Christian faith. This demands infallibility when teaching the faith. She must be prevented from teaching error in order to lead her members to the fullness of salvation.
The apostles are given Christ’s authority to make visible decisions on earth that will be ratified in heaven. Without a central authority in the Church, there would be chaos (as there is in Protestantism).
In Matt 18:17-18, Jesus is clearly telling us that the Church is the final authority on questions of faith or discipline. Jesus says to take the wayward brother to the Church for reproval. Now, God would not command us to do the impossible. This means that God would have provided us with the information necessary to understand what “Church” He was talking about. Since Jesus uses “Church” only one other time (in Matt 16:18), it is obvious that this Church must mean the one He built upon St. Peter.
The Scriptural, patristic and historical records demonstrate that this Church could only be the Catholic Church. There was no other Church around at the time these words were penned. Moreover, only the Catholic Church can demonstrate a continuity and consistency in doctrine and morals which would be necessary if we are to make any sense out of Jesus’ words in Matt 18:17-18.
Where does the Baptist take his Pentecostal brother? Where does the Lutheran take his Methodist sister? Jesus’ words demand that there be one, authoritative institution to resolve the doctrinal or disciplinary issue. If not, then Jesus’ words would mean little. We would never have any consistency on doctrine and morals, the very ingredients that are necessary to our salvation. God is one and His Church is one. A kingdom divided against itself will not stand. That is why the Catholic Church has been around for 2,000 years, and the Protestant sects continue to splinter by the thousands each year.
I realize this verse is a tough pill for Protestants to swallow. They want to argue that the Bible is the only and final authority. However, not only does the Bible never say that, the Bible tells us the Church is the final authority. So, if they want to be faithful to the Bible, then they have to follow the Church. Of course, this forces them to determine what “Church” this is. And if they are truly honest with themselves, they know there is no other recourse than joining the Catholic Church.