If you haven’t read Plutarch’s Moralia (customs and mores) I recommend it to you. It is plainly but intelligently written and easy to read – as well as beguiling. Plutarch (c.46–c.120) was a Greek biographer and philosopher belonging to the Equestrian order of Rome. Plutarch’s antiquity does not compromise his writing. Astonishingly the same things mattered then as do now. Moralia contains unique and unexpected topics, among them talkativeness, curiosity, shyness, anger, how one can praise oneself without exciting envy, against borrowing money and how one may discern a flatterer from a friend (plus many more of equal relevance and amusement).