. . . “truth” and “objective” have a very well defined meaning. Your way of defining “objective truth” would exclude all the non-Christians from being able to participate. That is fine, just let’s make it clear: “non-Christians” are not welcome, because they are unable / unwilling to subscribe to OUR definition of basic concepts. And without a common understanding of basic words no conversation can take place. Actually, ALL morality is about interpersonal relations. What happens in THIS world is NOT irrelevant. But as long as we are unable to carve out a common starting platform, we shall not be able to conduct a rational conversation.
I would disagree that “‘truth’ and ‘objective’ have a very well defined meaning”. Quite the opposite, these terms are used in very different ways and debated. I do believe from your feed back that you did understand what my words were getting at. I seems to me that you do not agree to the reality to which, I say, they point.
What I am asserting is that the ultimate truth is God, and that He is other to us: Objective Truth.
The truth is also that He is Love, not the emotion but a total giving to the other that brings union - the reality of the Trinity. Another truth is that consciously or unconsciously, we are on a journey in life, towards or away from love. That is where morality comes into play. Eastern religions call it Dharma, the cosmic order, part of which includes mankind’s spiritual evolution leading towards transcendence of what is understood to be the cycle of death and rebirth.
I find no difficulty in conversations with Hindu’s and Buddhists, and most times, rather than devolving into an argument, it can be spiritually enlightening. This is because there is respect for the other person’s view and an attempt to understand one another. It is possible to communicate from different perspectives. No one is excluded other than those who wish to exclude themselves by not wanting to listen. It makes no sense that someone would come to a Catholic site unprepared to try to grasp how different Catholics interpret their religion. It is an opportunity to listen and learn.
Let me address the points you make, the first being that all morality is about interpersonal relations. Clearly, it is about relationships; how to be in right relation to what is other. We have relationships with not only people, but the world of matter and other beings: bacteria, plants, animals. We can form relationships with disowned or projected parts of ourselves, trying to reintegrate who we are. The basic, essential relationship is with the Ground of our being. Whether one is a materialist, pantheist, deist or theist, the relationship with reality that reflects the particular world view impacts on the view of oneself and on every relationship. I am asking you to consider is that the Truth, and you might agree, is more than some blind, purely material being. It is relational, and all creation reflects this nature, even simple matter. All morality can be said to be interpersonal, but I would add, with the proviso that the fundamental Persons with whom we relate exist as the one Triune Godhead.
Most definitely, what happens in this life is not irrelevant. We have one shot at this; what we do, we do for all eternity. Some believe that this life is not remembered, since the world does not remember. However, what is at the Centre of every moment, knows every moment. This being here now is connected in eternity to all moments that exist in their space and time. Surrounded by oblivion in time, the events which fill this moment, exist. The Ground of that existence, that makes the awareness happen, is ever awake, knowing all. What we do with our time in this transient world to be swallowed into nothingness is definitely of importance as we determine who we are for all eternity. And, it has also been revealed that our being does not stop with death.
What is meaningless, is the quest for power, honour, pleasure and things. Where we find our purpose is in what exists beyond the transient and illusory. We give ourselves to this life, passing what has been given to us, onto others, honouring and following the will of our Creator. When God is held to be primary, and some know Him through relationships other than Christianity, good things follow, doing His will. All human attempts to make this world, heaven, without God, will fail. Desiring to be gods, without God, we have created Aleppo. Through the incarnation, death and resurrection of Jesus Christ, we will be gods, at one with Love. Without a common starting platform rooted in the reality of God, all this is simply noise, the incomprehensibility that follows the construction of yet another, this time moral, Tower of Babel.