Sententia

A sententia (Latin for 'opinion' or 'judgement') is a brief, aphoristic sentence delivered with the authority of general truth. In classical rhetoric it is one of the ornaments a speaker is expected to command — the ability to compress the moral of a paragraph into a single memorable line, often placed at the end of the argument to send the audience home carrying it.

Sententia differs from the aphorism in setting more than in form. An aphorism is a freestanding literary object; a sententia is a moment inside a longer text, deployed for structural effect. Cicero, Seneca, and Tacitus use sententiae as pillars in the middle of a paragraph or as a closing hammer at its end. The technique migrated into medieval sermons and, from there, into English prose.

Shakespeare's plays are studded with sententiae, especially in the mouths of older characters: Polonius's 'Neither a borrower nor a lender be' is a sententia in the Elizabethan sense — a moral commonplace, delivered with weight, functioning as a small closing statement. Modern political speech uses the same technique, closing a section of argument with a memorable general truth: 'We do not do these things because they are easy, but because they are hard.'

The risk of sententia is that it can shade quickly into the sententious — a tone of unwarranted grandeur. A good sententia sounds inevitable in context; a bad one sounds like the writer is quoting themselves. The safest use is to earn the line through the paragraph that precedes it, so that when the sententia lands, it feels like the paragraph has been arriving at exactly that sentence.

For writers: keep a running notebook of your own sententiae. Most of them will not survive. The few that do — the ones that still sound true a year later — are the sentences worth building future essays around. Almost every essayist's signature line began as an unremarked sententia at the end of an early draft.