“Of course bishops emeritus must stay out of the everyday governance of the Church, but when it comes to doctrine, morality, faith they are obligated to speak by divine law. All have promised during episcopal consecration to defend the ‘depositum fidei.’ The bishop and great theologian Ratzinger has not only the right but also the duty to speak and give testimony of revealed truth.”
“The apostles Peter and Paul, the founders of the Roman Church, gave their lives for the truth. Peter and Paul did not say: ‘Now there are other successors, Timothy and Titus, let’s let them speak publicly.’ They gave testimony right to the end of their lives, all the way to martyrdom, with blood.”
“A bishop emeritus, when he celebrates a Mass, in the homily must he not speak the truth? Must he not speak of the indissolubility of marriage only because other active bishops have introduced new rules that are not in harmony with the divine law? It is instead the active bishops who do not have the power to change the divine law in the Church. They have no right to tell a priest that he must give communion to a person who is not in full communion with the Catholic Church. No one can change this divine law, if one does so he is a heretic, he is a schismatic.”
Cardinal Gerhard Mueller, April 16, 2019