I have to stick to the scriptures, friend. :e4e:
The Magisterium are the successors of the Apostles of the Scripture. 1st Timothy 5:22 talks about the sacrament of Holy Orders, through which the Church is gifted by our Lord with a new priest, and/or, most especially, a new bishop, which the Apostles were the epitome, and some New Testament characters like Timothy and Titus and Luke and Mark were, because they were not Apostles, but they were, bishops. The Magisterium are the bishops, and all of them, and their test for orthodoxy is simply whether or not they are "in communion with" the successor of Peter, who resides over the See of Rome, the Holy See, the pope, who succeeds Peter, who died in Rome, as the supreme pastor of the whole (catholic) Church, when he was crucified, upside down, by his own request, the upside-down cross being Peter's cross. The bishops by virtue of not only their theological acumen, which is substantial, but also because many of them know by heart the
whole Apostolic tradition, which guarantees that the pope will always be supported by a supermajority of bishops in any matter requiring his ex cathedra charism of infallibility in teaching matters of faith, doctrine and morals. The bishops always teach infallibly, as did the Apostles. This is a gift from our Lord. His living teaching presence. I stick to Scripture too, and the Apostles are in Scripture, and Holy Orders is in Scripture, so today's Magisterium are also in Scripture.