Amen.

That’s what the pope does infallibly,
every time he expounds or defends doctrine concerning faith or morals, and truths closely connected to them, when he speaks
ex cathedra. (from the chair of St. Peter).
As for “how many times,” the answer is:
so many times that it is impractical to count. The pope teaches infallibly when expounding and
defending the deposit of faith from the Chair of St. Peter. How many times has the popes over the past 20 centuries expounded and defended the deposit of faith? I would imagine that happens daily, in the ordinary universal teaching of the Roman Pontiff.
However, Catholics seems to like to focus upon the occasions when the pope exercises his extraordinary teaching authority. Pope St. Peter did this, for example, when he expounded upon what Holy Scripture called in Greek, “
dogmata.” (Acts 16:4), the plural form of the word “dogma.” So, the first pope pronounced dogma infallibly, as guided by the Holy Spirit.
Did Pope St. Peter make up “something new?” Not at all. Although this dogma was disputed in the minds of some Christians of the “
circumcision party” (Acts 11:2) who St. Paul says “
came from James” (Gal 2:12), St. Peter ended all dispute when he
infallibly expounded and defended the deposit of faith on the matter at the council of Jerusalem.
Pope St. Peter prefaces his ex cathedra address with an affirmation of papal primacy: “
After much discussion, Peter got up and addressed them: 'Brothers, you know that some time ago God made a choice among you that the nations might hear from my lips the message of the gospel and believe.’” (Acts 15:7).
So, prior to expounding and defending dogma, Pope St. Peter reminds the apostles and presbyters at that council that “
God made a choice among you.” What was that choice? That from the
voice of Peter, the nations might hear the gospel and believe.
God made this choice. It was not an invention, but was part of the deposit of faith itself.
What Pope Peter expounded and defended ended all further dispute on the matter.
How did
first century Christians react to
dogma pronounced by the pope? “**They rejoiced for the consolation (Gk **
paraklesis)” Where have we heard this word before, paraklesis?
Acts 19:31 “the churches throughout (Gk
ekklesia kata holos, or “
catholic church”)…were edified; and walking in the fear of the Lord, and in the
comfort (Gk
paraklesis) of the Holy Ghost, were multiplied.”
How do today’s faithful react to dogma pronounced by the successor of Peter? With joy for the consolation!