It's commonly known history. Read the letters of the early Church fathers and other documents of the early Church and you will see it, clear as day. You can't use Scripture as your only source of Christian history. The Bible is not a history book. It's purpose is to convey religious truth. Scripture is not that relevent to this part of the discussion. There is little to no scriptural basis for a lot things (though there is some for Purgatory, etc.). Why should there be? The authority to teach was given to the Church, not to the Bible, which didn't even exist for a great deal of time. Christ never said anything about any Bible (not to imply he did not think the Jewish Scriptures were important - of course he did, but there is nothing that indicates he commanded the New Testament to be written). And since the canon of Scripture was set by the Church, you can be sure there is nothing in it contradictory to Church teaching. If there were, they would have simply left it out, obviously. So arguing that every religious truth must be present in Scripture or that anything in Scripture is contradictory to Catholic teaching is an argument that is lost before it is even made. They are the same, and they DO have the same name - The Catholic Church. You can go to mass in a different Catholic Rite each week, and you will get the same thing. They may use icons instead of statues in their churches, wear different looking vestments, etc., but the substance is all the same. There will be scriptures read, the Eucharist will be celebrated - it is a Catholic Mass, wherever you go. The point here is that it is not a true statement to say that the Catholic Church does not allow married men to become priests. It does. There are married priests. Their original misison? To preach the Gospel, tend to the spiritual lives of the faithful, serve the poor...it's all there. There have been liturgucal abuses in the past that make what we have today look like nothing. Frankly, I'm relieved to be a Catholic now, when we have a great and holy man as Pope, when our communiucations technolgy allows us free access to important and relevent Church documents, and when a new wave of orthodoxy is washing over the Catholic youth. There is no fundamental difference from the very first days of the Church to what we have now in terms of the mission and function of the Church. It has survived for two millennia only by the grace of God. We have his promise that the gates of hell would never overcome it. If it were a mere mortal institution, what with all the challenges and hardships it has faced, it would have gone down in flames long ago. Satan hates the Church, and I'm sure he will always make sure we are challenged and our faith put to the test, but he will never win. Indeed, he has already lost.