It cannot be false, in so far as the principles are correct, the sequence rigorous, and all facts relevant to the question are adequately gauged and put into the reckoning. A very difficult thing to do in the concrete sciences: not so difficult in arithmetic, geometry, and formal logic, upon which abstract sciences the demonstratio of the schoolmen, the Aristotelian apodeixis, is modelled.

Of God and His Creatures: 4.92