Be Kind For Everyone You Meet

This was not said by Socrates or Plato. According to the Quote Investigator and Oxford Reference, the saying originated with Scottish minister Ian Maclaren (pen name of Rev. John Watson), who wrote "Be pitiful, for every man is fighting a hard battle" in The British Weekly around 1897. The word "pitiful" originally meant "full of compassion." The misattribution to ancient philosophers is a 21st-century internet phenomenon.