23 For these reasons it is evident how terribly wrong those few were who in Italy, and under Our very eyes, wanted to undertake a mission which they received neither from Us nor from any of Our Brethren in the episcopate. They promoted it not only without due homage to authority but even openly against the will of that authority, seeking to rationalize their disobedience by foolish distinctions. They said that they were undertaking their cause in the name of Christ; but such a cause could not be Christ's since it was not built on the doctrine of the Divine Redeemer. How truly these words apply: "He who hears you, hears me; and he who rejects you, rejects me." "He who is not with me is against me; and he who does not gather with me scatters." This is a doctrine of humility, submission, filial respect. With extreme regret We had to condemn this tendency and halt by Our authority this pernicious movement which was rapidly gaining momentum. Our sorrow was increased when We saw many young people of excellent character and fervent zeal and capable of performing much good if properly directed, and who are also very dear to Us, carelessly attracted to such an erroneous program.
Source: Il Fermo Proposito (Vatican.va)