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Dennis Prager along with thousands of other Jewish thinkers over the centuries, cut his teeth on Talmud - the oral law. The Talmud supplements and interprets the written law which is found in the Torah - the five books of Moses.

One important Jewish thinker widely believed to have also learned logic from studying the oral law was the Apostle Paul, the founder of Christianity in the view of disinterested scholars. In truth, as opposed to Christian myth, Paul was not a learned Jew, and shows little knowledge of Pharisaic logic.

Listening to Prager speak, one will often encounter his use of a fortiori reasoning, known in Hebrew as khal va-khomer. It literally means light and heavy. If you know about one thing has an amount in a light form, then it must be true all the more so of some other thing that has the quality in a heavy form. So, if a person should not drive after drinking a certain quantity of beer, how much more so should a person not drive after drinking the same quantity of whiskey.

I am quoting an example from page 65 of Hyam Maccoby's excellent book THE MYTHMAKER: Paul and the Invention of Christianity.