Say What? Discretion is the better part of valor / When in Rome, do as the Romans do

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Happy Friday, grammar lovers, and welcome back to "Say What?"

Today we'll be looking at two very familiar sayings, discretion is the better part of valor and when in Rome, do as the Romans do, both of which deal with prudence (and, in the latter's case, also a bit of politeness). So without further ado, let's have at it! ( With examples from Supernatural. )