[biblewonk]

Thus the insufficiency of sola scriptura and the need for a living Magisterium.

Neither term is in the bible and I have no idea what the second one is.

[Petrosius]

Sola scriptura (Scripture alone) is the Protestant idea that the Bible is the only authority.

The Magisterium is the teaching authority of the Church given by Jesus to the Apostles which has been handed down and continues today with the bishops in communion with the Pope.