ON THE ONE HAND, human beings and human conditions are changing, at least since the recent centuries.
If someone is asking the proof, then one just needs to have a quick look on
- Ukraine and how the wars will be handled (migration & exile and robotic fights vs idea about patriotic death in war) (changing ethics) or
- growing possibilities to have babies with both parents being gay, example: Reproduction revolution: how our skin cells might be turned into sperm and eggs (decoupling procreation from the sex) or
- emerging therapies that tries to revert aging and tries to eliminate age-related death, example: The Rejuvenation Roadmap (understanding and control of life) or
- emerging gene editing (CRISPR) and gene modification therapies (e.g. as delivered by virus vectors) and integration with externalities both carbon and silicon based (allows during-life modification/improvement that invalidates the necessity of usual evolution-trial-error-death cycle for the historic evolutionary development of human beings).
I agree that one can discuss whether or not the current achievements of human beings and human conditions are qualitatively different from two thousand years ago. But one can hardly deny that bigger or smaller changes are happening and that there will come a point when all the accumulated changes will force us to say that a qualitative change has happened.
My premise is: there is no rational/scientific rule that precludes a change of human beings or human conditions.
ON THE OTHER HAND, there is this emphasis that Jesus's teaching is immutable, that it can have only different interpretations in the different contexts and times.
How do we understand this immutability of Jesus teaching? Why is it important? Why such immutability has any value or transcendental meaning? How to understand this from the metaphysical point of view, that immutability has any value?
We know that different cultures accept the notion of constant changes, whether cyclical or other type of developments. We know that the fundamental constants of physics are changing, albeit very slowly. We have even guessed that the change of those constants can indicate that the entire Universe is somehow developing in some meaningful direction, that it learns.
Therefore, in light of all of this, what is the meaning, value, and transcendental significance that something should be immutable; in this case, the teaching of Jesus? Why should we say and accept that the very immutability as such has some goodness, some good quality? Is there a rational explanation of this goodness? Is there a Scriptural basis for the goodness of this immutability? If so, how do we connect this scriptural basis with rational thinking?
We have seen that the Church has been guided by the Holy Spirit (and expressed through the clergy, theologians, Ecumenical Councils and Synodal movements) to form the ecclesiastical and sacramental structure that was only remotely sketched out in the Scripture or in the Initial Tradition. Maybe we are starting to see how the Church as guided by the Holy Spirit and as expressed by Synodal movements is starting to decouple Jesus's teaching from Jesus's meta-teaching and is starting to establish the processes by which changes in moral laws can be discovered, evaluated and approbated?