Utopia by Thomas More Chapter 6 Page 54

yet, by several impressions, they have multiplied them into many thousands. If any man was to go among them that had some extraordinary talent, or that by much travelling had observed the customs of many nations (which made us to be so well received), he would receive a hearty welcome, for they are very desirous to know the state of the whole world. Very few go among them on the account of traffic; for what can a man carry to them but iron, or gold, or silver?

which merchants desire rather to export than import to a strange country: and as for their exportation, they think it better to manage that themselves than to leave it to foreigners, for by this means, as they understand the state of the neighbouring countries better, so they keep up the art of navigation which cannot be maintained but by much practice.