Especially Ordinatio Sacerdotalis.
Look at the words the Pope used, "Wherefore, in order that 'all doubt' may be removed regarding a matter of 'great importance', a matter which pertains to the Church's divine constitution itself, in virtue of 'Our' ministry of confirming the brethren. 'We' declare that the Church has no authority 'whatsoever' to confer priestly ordination on women and that this judgment is to be definitively held by all the Church's faithful."
So solemn is this declaration that St John Paul reverts to the rarely used 'Papal We' in making it.
It is precisely because of the Holy Ghost that Pope Francis cannot be explicit about remarried divorcés receiving Holy Communion, why he won't address the 5 dubia. His supporters in the Curia and the College of Bishops are publicly answering them for him, he won't be accused of uttering any potentially damaging or heretical statements.