Basically, we do as we please.
So, me, I start with facts, and then I do like everyone else still alive, rely a lot on assumptions.
Because anyone limiting himself to the facts of his own subjective experience would die rather quickly. We survived because there is a lot of assumptions we use, and we don't even think about them.
Alternatively, you could try to prove to me that you never rely on any assumption whatsoever.
Try to prove that.
Not the world as I think of it. So, you would need to prove that.
Maxwell?! Max Karl Ernst Ludwig Planck.
And no, he didn't know that. It's tautological that the idea of matter is derivative. However, that in itself doesn't prove there is nothing like matter as we conceive it independent of our mind.
Unless you could prove it?