Philosophers usually distinguish between form and matter, rather than form and substance. Matter, as opposed to form, is then what is supposed to be formless. However, if there is anything that physics – as a science – has taught us, is that matter is defined by its form: in fact, it is the form factor which explains the difference between, say, a proton and an electron. So we might say that matter combines substance and form.
Now, we all know what form is: it is a mathematical quality—like the quality of having the shape of a triangle or a cube. But what is (the) substance that matter is made of? It is charge. Electric charge. It comes in various densities and shapes – that is why we think of it as being basically formless – but we can say a few more things about it. One is that it always comes in the same unit: the elementary charge—which may be positive or negative. Another is that the concept of charge is closely related to the concept of a force: a force acts on a charge—always.
We are talking elementary forces here, of course—the electromagnetic force, mainly. What about gravity? And what about the strong force? Attempts to model gravity as some kind of residual force, and the strong force as some kind of electromagnetic force with a different geometry but acting on the very same charge, have not been successful so far—but we should immediately add that mainstream academics never focused on it either, so the result may be commensurate with the effort made: nothing much.
Indeed, Einstein basically explained gravity away by giving us a geometric interpretation for it (general relativity theory) which, as far as I can see, confirms it may be some residual force resulting from the particular layout of positive and negative charge in electrically neutral atomic and molecular structures. As for the strong force, I believe the quark hypothesis – which basically states that partial (non-elementary) charges are, somehow, real – has led mainstream physics into the dead end it finds itself in now. Will it ever get out of it?
I am not sure. It does not matter all that much to me. I am not a mainstream scientist and I have the answers I was looking for. These answers may be temporary, but they are the best I have for the time being. The best quote I can think of right now is this one:
‘We are in the words, and at the same time, apart from them. The words spin out, spin us out, over a void. There, somewhere between us, some words form some answer for some time, allowing us to live more fully in the forgetting face of nonexistence, in the dissolving away of each other.’ (Jacques Lacan, in Jeremy D. Safran (2003), Psychoanalysis and Buddhism: an unfolding dialogue, p. 134)
That says it all, doesn’t it? For the time being, at least. 🙂
Post scriptum: You might think explaining gravity as some kind of residual electromagnetic force should be impossible, but explaining the attractive force inside a nucleus behind like charges was pretty difficult as well, until someone came up with a relatively simple idea based on the idea of ring currents. 🙂