The Greek verb artuō means 'to season' or 'to prepare with seasoning,' particularly with salt. It is used in the New Testament in the context of both literal salt and the metaphorical use of salt to describe the quality of Christian speech and witness.
Paul's instruction in Colossians 4:6 — 'Let your conversation be always full of grace, seasoned with salt' (artuō) — transforms a culinary metaphor into a communication principle. Just as salt enhances food, preserves it from decay, and gives it flavor, so Christ-formed speech should enhance, preserve truth, and bring life to every conversation. Jesus says 'salt is good, but if it loses its saltiness...' (Mark 9:50). The Christian's influence in the world depends on maintaining the distinctive 'flavor' of grace, truth, and Christlike character — refusing to become bland by compromise. Speech that is seasoned with grace is both truthful and kind.