Like most readers, I rarely or never feel quite sure what our Holy Father actually means. Added to this is our natural inclination to treat with respect whatever a Roman Pontiff says (even when he speaks in a low Magisterial register). Accordingly, I am unwilling to join in the widespread criticisms of statements like his homily yesterday (Monday), in which he spoke about accepting new teaching, or 'surprises', from the Holy Spirit, 'new wine', and such things.
But I will remind you of something which we know we are bound to believe because it is the dogmatic teaching of an Ecumenical Council (Vatican I), worded with clarity.
"The Holy Spirit was not promised to the successors of Peter so that, by his revelation, they might reveal new teaching,
so that, by his assistance, they might devoutly guard and faithfully set forth the revelation handed down through the Apostles, or in other words, the Deposit of the Faith."
If Pope Francis, or any pope, were ever to teach contrary to that doctrinal statement, he would be teaching heresy. A pope is as subject to Catholic Doctrine as I am and you are.
It is therefore the duty of each of us to gloss his words with such a hermeneutic as to be able to read them as being not contrary to what was taught by Vatican I.