the point is whether a concept is something or nothing
just how to define concept -
is any thought a concept or does a concept have a formal
status -
so we can say what is - what is not -
what it does - what it does not do?
Spinoza says only that we know the mind in an active
and passive modes
a concept - or the formation of concept is an active
function of mind
(E.pt. II. def. III.)
beyond this Spinoza has I think nothing specific to say
on the logic of concept
my argument is that a concept at the very least defines -
if you like a class of entities
and that therefore you cannot have a concept that does
not discriminate -
and for this reason -
you cannot have a concept of everything
it's a false concept - regardless of how you define it
therefore the concept of substance cannot be formed
