salt: the everyday mineral used to season and preserve food, and a rich image for what preserves, purifies, binds, and lasts.
In the New Testament this word never strays far from the kitchen: at bottom it is the ordinary salt that flavors and preserves food. But salt in the ancient world carried meaning far beyond the table.
- It sealed agreements (an offering was sprinkled with salt, and a lasting bond was called a covenant of salt)
- it purified sacrifices
- it stood for wit and grace in conversation
- in the wrong hands it was scattered over a conquered city to curse its ground into barrenness
When Jesus and Paul call people or their words salt, they draw on that whole web of associations at once.
That is why careful readers resist boiling the word down to a single idea. In one well-known list, the single phrase "you are the salt of the earth" has been given as many as eleven possible overtones. The point is not vagueness but economy: one vivid image that an ancient hearer would have felt on several levels together, depending on the setting.
The New Testament settings pull out different threads. Jesus tells his followers they are the salt of the earth, salt that must never lose what makes it salt. He tells them to have salt in themselves and be at peace with one another, tapping the old custom of sharing salt as a bond of friendship. Paul tells the Colossians to let their speech be seasoned with salt, gracious and wise toward outsiders. The mineral is the same everywhere; what changes is which of its qualities a passage brings forward.
Nuances
What it means for Christian speech to be seasoned with salt in Colossians 4:6.
- majorityA combination of gracious or winsome, wise and apt, and wholesome (as against corrupt) speech; the dominant modern reading, which grants the pagan wit background but holds that Paul repurposes it for grace-shaped discourse ready to answer each outsider.; James D. G. Dunn, The Epistles to the Colossians and to Philemon (NIGTC, 1996); Peter T. O'Brien, Colossians, Philemon (WBC 44, 1982); Douglas J. Moo, The Letters to the Colossians and to Philemon (Pillar, 2008)
- minorityPrimarily wit and urbanity, an intellectual rather than a moral quality, on the model of the Greek and Latin use of salt for clever, pointed speech.; Charles J. Ellicott, A Critical and Grammatical Commentary on St. Paul's Epistles to the Colossians and Philemon; A. S. Peake, Colossians, in The Expositor's Greek Testament, vol. 3