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Ontological Arguments
So a posteriori knowledge would be knowledge like:
The best way to fix a car
How to cure a particular disease
The galaxy, stars and stellar objects exist
A priori knowledge is things like:
Mathematical truths
`I think, I am'
Note that a priori knowledge can be acquired by
empirical means (e.g. complex mathematical truths)…read more

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Ontological Arguments
So those who believe in ontological
arguments believe we can prove the
existence of God in the same way we can
prove 2+2=4.
That we can, just sitting in an armchair and
thinking about it, come to realise that God
exists.…read more

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St. Anselm (1033-1109)
Famous Italian medieval
philosopher.
Openly opposed the Crusades.
The founder of scholasticism.
Famous for writing the Proslogion
(which contains his OA).
Notably, there's no reason to think
this stems from the early Greek
version!…read more

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Anselm's Ontological Argument
Anselm takes God to be `that thing of which
no greater can be conceived'
Sound good?
Surely it is good isn't it?
Even the atheist, who doesn't believe in God,
should think that's a good definition.
After all, they agree that's the definition they
just deny that such a thing exists.
Anselm then says:…read more

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Anselm's Ontological Argument
Thus even the fool is convinced that something than which
nothing greater can be conceived is in the understanding, since
when he hears this, he understands it; and whatever is
understood is in the understanding. And certainly that than
which a greater cannot be conceived cannot be in the
understanding alone. For if it is even in the understanding alone,
it can be conceived to exist in reality also, which is greater. Thus
if that than which a greater cannot be conceived is in the
understanding alone, then that than which a greater cannot be
conceived is itself that than which a greater can be conceived.
But surely this cannot be. Thus without doubt something than
which a greater cannot be conceived exists, both in the
understanding and in reality.…read more

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