[Aquinasfan]

"1 + 1 = 2" is a non-material truth limited neither to time nor place. An eternal, spiritual truth must be held in existence by an eternal, spiritual source of truth, a source which everyone calls God. QED.

OK, it's not a strictly mathematical proof.

[general_re]

An eternal, spiritual truth must be held in existence by an eternal, spiritual source of truth...

Why? If it's eternal, perhaps it was always there ;)