Vatican canonizes un-Catholic popes

[MagisterMusicae]

Vatican I says

 "I affirm that the power of indulgences was left by Christ in the Church, and that their use is eminently beneficial to the Christian people."

Therefore this statement of Vatican I infallibly proves that  Pabbie is right and Magister is wrong. Regardless of actual context. 

I guess with such a clear rebuttal of my position, I must concede.