I did not miss your point. You asked how it can change. Simple. Practice can change. Practice based on Scripture can change. How? Because more than one practice can be based in Scripture.
Come on, pnewton… to be based on Scripture or founded upon Scripture does not necessarily mean chapter and verse verbatim, but rather the principle derived from Scripture to support a particular teaching. For example, abortion is not explicitly prohibited in Scripture, but that does not mean that the Church’s teaching on abortion is not based on Scripture.
And yes, a practice can change if it is not tied directly to doctrine… so eating fish on Fridays, priests wearing green during Ordinary Time in the Latin rite, etc. can change. The practice of baptizing with water or consecrating wheat bread for the Eucharist is connected with doctrine, so one cannot change the practice to baptizing with sand and consecrating potato chips to confect the Eucharist. What’s more, the exhortation I cited from Pope John Paul II (note that I am not even referring to FC) and the document from the CDF issued by Ratzinger under the instruction and permission of Pope John Paul II state that the practice in discussion regarding no Communion for the divorced and remarried here is
binding and
cannot be modified. This is what I’m wrestling with as this now proves that either Pope John Paul II was then mistaken or that Pope Francis is presently mistaken.
APOSTOLIC EXHORTATION
RECONCILIATION AND PENANCE
the church
can only invite her children who find themselves in these painful situations to approach the divine mercy by other ways,
not however through the sacraments of penance and the Eucharist until such time as they have attained the required dispositions.
CONCERNING THE RECEPTION OF HOLY COMMUNION BY DIVORCED AND REMARRIED MEMBERS OF THE FAITHFUL
Vatican Congregation for the Doctrine of the Faith
“… constant and universal practice,
founded on sacred Scripture, of not admitting the divorced and remarried to holy communion.” The structure of the exhortation and the tenor of its words give clearly to understand that this practice, which is presented as
binding, cannot be modified because of different situations.
This norm is not at all a punishment or a discrimination against the divorced and remarried, but rather expresses an objective situation that of itself
renders impossible the reception of holy communion.
How can one pope state that a change in discipline would be “impossible”, that this is a “constant and universal practice”, which is “binding” and “cannot be modified because of different situations” and another pope say that it is possible, it will now no longer be constant and universal, no longer binding, and can indeed be modified because of different situation?