Book excerpt: Rhetoric gives our words the power to inspire. But it's not just for politicians: it's all around us, whether you're buttering up a key client or persuading your children to eat their greens. You have been using rhetoric yourself, all your life. After all, you know what a rhetorical question is, don't you? In this updated edition of his classic guide, Sam Leith traces the art of argument from ancient Greece down to its many modern mutations. He introduces verbal villains from Hitler to Donald Trump - and the three musketeers: ethos, pathos and logos. He explains how rhetoric works in speeches from Cicero to Richard Nixon, and pays tribute to the rhetorical brilliance of AC/DC's "Back In Black". Before you know it, you'll be confident in chiasmus and proud of your panegyrics - because rhetoric is useful, relevant and absolutely nothing to be afraid of.