Here is what I don't understand: How on earth anyone can say that NFP is the same as ABC.
talk to St. Clement, St. Jerome, St. Augustine and the others caught in that quote mine which goes the rounds to support the Vatican's HV.
ABC violates natural law
The Orthoox moral theology of Christ's Church comes from His Gospel, not natural theology.
because it purposely frustrates the normal functioning of the human body with regard to reproduction.
And what if it does not succeed?
Then there is withrawal.
NFP does no such thing.
Action theory, another obsession of the Vatican, picked up by Aquinas.
There are supposed to be only certain days during the month when woman has a substantial probability of getting pregnant.
And, acordoing to the consensus of those fathers the HV quote mines cite, that is the ONLY time you should engage in intercourse.
There are supposed to be days when that probability is extremely low. This is written into the nature of the female body.
and forms the basis of the chemistry of the contraceeptive pill. Btw the probability when she is already pregnant is practically if not nill.
This is a real and substantial difference.
That is a distinction without a difference.
And that real difference leads to practical results in the building of virtue. One method (NFP) teaches a person self control,
I wasn't aware "NFP" inclued coitus interruptus, which entails LOTS of self control.
the other (ABC) teaches a person to satisfy his or her passions on demand.
As Fatehr has pointed out, as long as they are willing to risk pregnancy, they can satisfy their passions 24/7 on demand.