The Importance of Effectual Truths

An effectual truth is a truth that has to do with doing or the things that come from a deed or something that's done. Machiavelli often contradicts his rules, yet we found those rules to be infallible,. And he subtly pointed poking holes in them. If you think about the West in 1500, what are the two sources of morality in the western world? The Bible on the one hand and Greek philosophy on the other.