And how could there be a “common good”! The expression contradicts itself; that which can be common is always of small value.
What a idiot. Pennies are common and of small value but you can collect quite a few of them if you are determined. Small goods are still good. also, the common good isn't a small good, it is a sort of good that helps all (good in common) or a good which is often needed (frequently found good.)
He doesn't stop to ask himself, "could I be wrong?" or "how would I know if I were wrong?"

