A Necessary Being is anything that meets the following two conditions:
    1. It is possible that it is a cause of something.

    2. It is not possible (at any time) that it does not exist.

I will stipulate one axiom: if there is a Necessary Being, then it is necessary that there is a Necessary Being.

A comment about 'possible'.

I define 'it is possible that such and such' as 'the statement that such and such does not contradict anything that must be so (is necessary)'. Examples of things that (ostensibly) must be so include:
    1. Every triangle has three sides.

    2. No prime minister is a prime number.

    3. Hurting babies solely for fun is bad.

    4. Nothing is both true and not true at the same time.

    5. If something has size, then it has shape.
And so on...

So something is possible if it doesn't contradict what is necessary.

I take it that 'necessary' is a familiar term whose meaning we learned at our mother's knee. So, I do not define the term further. But others are welcome to define the term in a way that makes sense to them. I only require that your definition allows the following to come out true: if something is the case no matter what possible situation is actual, then that something is necessarily the case. For example, if it's the case that triangles have three sides no matter what possible situation is actual, then it is necessary that triangles have three sides.

Note that the notion of 'necessity' here is objective necessity: that is to say, if something is necessary, then it must, by nature, be so -- no matter what anyone may or may not know. For example, it is necessary that certain axioms entail the Pythagorean Theorem, whether or not I happen to know this.
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