Before there were clickbait articles
Clearly, Chris Heivly here considers this a huge chidush. But that's because he likely was never exposed to Pirkei Avos. Those 6 chapters of Mishna that we read in the weeks between Pesach and Shavuos contain a great deal of wisdom that applies to social and business interactions. Among them are two that cover his advice. One is the advice of Rabbi Masya ben Charash (4:20) " Be the first to greet every individual." And in the first chapter (15) the last part of Shammai three-part exhortation is: הוי מקביל את כל האדם, בסבר פנים יפות Greet everyone with a pleasant countenance.
Bearing this in mind, the next time I'm tempted to click something that sounds like clickbait, perhaps I'll just open up Pirkei Avos instead. If the advice online is for anything beyond modern technology and really holds up, it's probably already in there.
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