The first document is the Apostolic Constitution of Pope Paul VI on the Church's teaching regarding indulgences:
they are founded on divine revelation, and the Church is now making certain changes in how they are to be gained.
"In the face of growing confusion about the doctrine of the Faith, many bishops, priests, religious and lay people of the Catholic Church have requested
that I make a public testimony about the truth of revelation."
This is it.
The Syllabus of Errors is just as relevant today as when it was first published. For the Syllabus, as appears from
the official communication of Cardinal Antonelli, is a decision given by the pope speaking as universal teacher and judge
to Catholics the world over. All Catholics, therefore, are bound to accept the Syllabus. Exteriorly they may neither in word
nor in writing oppose its contents; they must also assent to it interiorly.