Fascinating - I go back to asking what is meant by ‘world’ and ‘matters’.
Thinking about what
@aeon said, our access to any aspect of an external reality is always mediated by our mental matrix - what we experience is a virtual reality completely contained within our heads. We can only hope that it bears sufficient congruence with any objective external reality to allow us to sustain ourselves at many different levels of our subjective existence. But there seem to be countless ways that our subjective reality can do this, because ‘sufficient’ seems to allow very many different subjective realities.
But is there an actual, concrete external reality? In my own worldview there’s no way of telling from my subjective inside. My ongoing existence seems to confirm inductively that an external reality is highly plausible, but the understanding of science suggests that it is very different to what I experience subjectively.
And then I could be deluded. Maybe we live in an objective virtual reality - that would explain apparent breakdowns in the order of things. For example, ghosts and miracles could be explained as programming ‘cheats’ in a VR. But it opens the possibility too that we could access the ‘code’ from the inside - so we could travel the universe instantaneously by just altering the code rather than seeking esoteric physics to do it.
What does it mean to say that I can affect the world rather than only affecting a world view? Well the modern synthesis of current human world views seems to be leading to a mass extinction along the scale of that which killed off the dinosaurs. But the only way I can perceive, process and act on that is through a world view. My personal philosophy is that I am free to choose out of several different world views because none of them can model everything that matters. It’s better for me to switch between them and see from all their different angles. But does that start to shape out a better view of a possible external world - a reality - for me? Or does it simply shape out a subjective meta-world view?
In the end, I think that my actions based on my world views do impact on an external reality - both a physical one, and also the subjective world views of others. But I don’t know this - for me it’s an act of faith which is in a sense the same in kind as whether I believe in God.
But these musings suggest there are many layers to the issue.
And then I start to evaporate when I realise that the idea of an objective world is itself dependent completely on those world views that contain such a thing. Maybe the universe in itself cannot be objectified like that.