I read this. My interpretation is “right” conscience is that it’s a “voice”, not a preference. To form that “right” conscience, one must first examine and study the Church’s teaching with a “ready and respecful allegiance of mind.” I take this to mean, you cannot reject something unless you have studied it with an open mind to the teaching – open to the possibility the teaching or the Church is Christ’s actual teaching, before negating or rejecting it. I think it begins with the proposition that the Church is correct before being proven wrong. As we know, it’s impossible to prove a negative.
It’s not a search for rejection, but being completely open to the teaching and still being unable to accept it. This tells me that a lot more study is required by Vatican II. It’s not enough to have the reasons why one does not accept a Church’s teaching, unless you are first open to the fact that the teaching is true and you are under obligation to research many sources, but after much study you still cannot accept the teaching. I also read that abortion is not one of these topics that one can study and decide for themselves. On this issue, the Catholic Church does not leave it to conscience.
Also, on other matters it’s important not to confuse conscience with “personal preference” – very easy to do.
My personal preference may to live with someone outside of marriage, but if after careful examination of everything that the Church teaches (with an open heart and mind to the Church), if I should then find that the teachings, Scripture, and by prayer, and counsel my mind begins to understand or accept even some part of the Church’s teachings (and the reasons for it), my preference cannot substitute for right or good conscience no matter how practical the argument might be for living together before marriage.
If this study leads to doubt of the preference (our presumed "conscience), then it was not right conscience that made me think that living together outside of marriage was my conscience. If one keeps an open mind to the study, I think it would become evident what is the right conscience and what is a preference. The deeper the study, the more obvious the distinction.
I wonder if people realize this, and then take the time to study an issue as required by before deciding that the decision is one of right conscience and not just a preference – easily mistaking their conscience for preference?
As to “conscience” – it also speaks to rejecting the secular despite the fact that things may be man’s law – such as Roe v. Wade or that it’s become generally acceptable for people to live together before marriage. A right conscience can reject (as some doctors have refused to perform abortions), man’s law or generally accepted societal practices.