I've been reading this thread and trying to decide the best place to jump in, because everyone posting here has demonstrated a misunderstanding about what a First Cause is actually referring to, and why it's argued to be necessary.
Firstly, the First Cause argument - more technically referred to as the Argument From Contingency - has absolutely nothing to do with time. People see the words 'first' and 'cause' and automatically think time is involved. Not so.
What this argument is about is the contingency of things in the universe, meaning their dependence on things outside of themselves for their existence. This isn't like a "I wouldn't exist if my parents hadn't made me" kind of dependence, but a "the very matter that composes my body isn't maintaining its own existence right now in this moment." Every single particle in my body could, possibly, at any given moment,
not exist; none of them exist
necessarily. They also depend on things outside of themselves in order to exist in this moment, things like the material conditions of the universe, to the laws that govern reality.
But do these conditions and laws exist
necessarily? Could they be conceived of as
not existing? While that would mean that the universe as we know it wouldn't exist either, it's reasonable to say that we can still conceive of such a scenario, yes? The fundamental laws of reality need to exist for everything else to exist, but do they need to exist from an objective standpoint? Of course not.
What this means is that everything in the universe is contingent; nothing exists necessarily, and so everything depends on something outside of itself for its existence - even the laws that govern reality.
Because of this, there must necessarily be some foundational reality which exists
necessarily - whose
essence is existence. To use an analogy, think of a chandelier being held up by a chain connected to a ceiling. The chandelier is dependent on the first chain link to hold it up, and that chain link is dependent on the one above it, and so on and so forth. Yet if we just had an infinite number of chain links, not connected to a ceiling, the chandelier couldn't be suspended in the air as it is, right? In order for the chandelier to be hanging in the air (to exist) it is dependent on there being a ceiling (a non-contingent thing) which isn't being held up by anything else and simply
is up in the air (obviously a ceiling is actually held up by the frame of the house, but hopefully you get the analogy).
None of this is to say that it's a flawless argument which cannot possibly be argued against, but I thought I'd try to help clarify what the argument is actually saying, because nobody I've seen here has understood it. And here's the actual argument itself:
- Every finite and contingent being has a cause.
- Nothing finite and contingent can cause itself.
- A causal chain cannot be of infinite length.
- Therefore, a First Cause (or something that is not an effect) must exist.