Hey James,
I apologize upfront for any confusion, it’s all my fault. We’re starting at an end conclusion of my ideas, and trying to work backwards. I’ve tried to answer your questions in a satisfying way, without writing out a huge wall of text. If something doesn’t jive, please ask and I’ll try to clarify!
But first, how does this necessity help us with the principle of sufficient reason…
Because the necessity can’t help but exist, no matter what.
and where does contingency come in to it?
This begins to dip into modal logic. In every possible world, a square has four sides, that is not contingent. In every possible world, Bill Clinton may or may not exist, so Bill Clinton is contingent.
Necessity is a property of something that is given by the definition of that something?
Kind of, while the analytic/synthetic distinction plays into this, I was just using examples are easy to follow and those happen to be tautological.
4-sidedness is necessary to a square, being single to being a bachelor. What is the value of saying that something is necessary if this refers to speech, discourse, definitions but not to physics and the natural world?
Well, if you want to talk about Physics, we have to cease talking about Metaphysics =)
To give you an example of how modern Metaphysics (and Philosophy) contribute to natural science, I’m going to borrow a concept from Saul Kripke; Let’s say I’m studying a human named James. If James is a human, James is essentially human, and you couldn’t cease to be a human without ceasing to be. What’s strange about this, is that it’s really just an a posteriori conjecture that this creature, whom I call James, is a human.
Do you see how this ontology plays a role in biology when talking about species? Another example would be mathematics, how do we know 2 + 2 = 4 is true? There isn’t an observation we make that confirms this, no experiment to do.
So my belief is, we have all these necessary things (abstracta) that seem to exist, have to exist, and there really isn’t a possible world where 2 +2 = 11. I hold, that if there is enough abstracta, you’ll eventually get concreta (stuff, basically).
In any case, are you really sure you can’t talk about ‘nothing’? You show your precise knowledge of what ‘nothing’ is by the expression of this reservation!
Well, we can, but it quickly loses the meaning people usually intend it to have. “Something came from Nothing” quickly turns into “Something came from Something else” which is an entirely different matter.