Have you gone to the Catechism links yet?
If he says He is sacrificed a thousand time, he is wrong.
Fr. O'Brien's statements may be, in some cases, ambiguous or invite erroneous interpretation.
Perhaps for Roman Catholics....but it is not Scripture.
We sometimes see this: a person who claims to be dialoguing, but actually refuses accurate information about Catholicism.
The quotes form O'Brien are presenting information deemed to be accurate ....by Roman Catholicism.
Have you gone to the Catechism links yet?
Yes...and I see confirmation of what O'Brien is saying.
If Fr. O'Brien--- I presume his earthly life is decades past, and may he rest in peace --- says that Christ is rendered present on the altar, not once but a thousand times, he is right.
If he says He is sacrificed a thousand time, he is wrong.
Fr. O'Brien's statements may be, in some cases, ambiguous or invite erroneous interpretation.
the priest brings Christ down from heaven, and renders Him present on our altar as the eternal Victim for the sins of man—not once but a thousand times!
The Catechism calls it a sacrifice in multiple places.
"And since in this divine sacrifice which is celebrated in the Mass, the same Christ who offered himself once in a bloody manner on the altar of the cross is contained and is offered in an unbloody manner," (Catechism of the Catholic Church, par. 1367).
This statement from Rome is contradictory.
At the Lord's Supper, Jesus had not yet been crucified.
You're going to have to explain how the bread and wine at the Lord's Supper were His actual flesh and blood while He was still alive.
Fr. O'Brien's statements may be, in some cases, ambiguous or invite erroneous interpretation.
Yet his works are credited with being accurate. His statement on the Mass was crystal clear. He was not ambiguous.
Again, you're suggesting a Roman Catholic ordained/trained priest doesn't understand what's happening during the Mass.