[Interviewer:] Which of the doubts formulated in your “Dubia” letter is the principal one? How would you try to explain it once more, succinctly, to a layman?

[Cdl. Brandmuller:] First: To pose “dubia”, i.e. doubts, questions to the Pope has always been a way of eliminating ambiguities. That’s completely normal. Then: Put simply, the question is: Can something be permitted today that was a sin yesterday? It is also asked if, as has always been taught, there really are actions that are immoral at all times and under any circuмstance? Such as, for example, the killing of an innocent man, or adultery? That’s what the issue ultimately is. Should, then, the first question indeed be answered with “yes” and the second with “no” — then this would be heresy [Irrlehre, “doctrinal error”] and subsequently [mean] schism. A split in the Church.

Do you really consider schism a possibility?

May God prevent it.