A consignment held at a foreign port, a quotation accepted on terms nobody properly understood, or a product sent to a market where it could not legally be sold: these are seldom the result of carelessness alone. More often, they arise because you cannot avoid errors if you don’t know what must be known. The phrase is obvious, yet it cuts against a modern habit of assuming that information is readily available and expertise can be acquired by a quick search.
In serious work, especially international trade, the difficulty is not merely finding facts. It is recognising which facts matter, seeing how one decision affects another, and understanding where personal knowledge ends. That judgement is acquired slowly. It comes from responsibility, from observing consequences, and sometimes from making a modest mistake before it becomes an expensive one.