James 3:12
My brothers and sisters, can a fig tree bear olives, or a grapevine bear figs? Neither can a salt spring produce fresh water — the cluster of agricultural examples universalizes the principle: nature determines product. A fig tree (syke) cannot produce olives; a grapevine (ampelos) cannot produce figs; a salt spring cannot produce fresh water. Each produces according to its nature. The application is clear: a redeemed heart should produce redeemed speech, not its opposite.