Here is the context:
It should be our endeavour to cultivate the peace and friendship of every nation, even of that which has injured us most, when we shall have carried our point against her. Our interest will be to throw open the doors of commerce, and to knock off all its shackles, giving perfect freedom to all persons for the vent of whatever they may chuse to bring into our ports, and asking the same in theirs. Never was so much false arithmetic employed on any subject, as that which has been employed to persuade nations that it is their interest to go to war. Were the money which it has cost to gain, at the close of a long war, a little town, or a little territory, the right to cut wood here, or to catch fish there, expended in improving what they already possess, in making roads, opening rivers, building ports, improving the arts, and finding employment for their idle poor, it would render them much stronger, much wealthier and happier. This I hope will be our wisdom. --- Notes on the State of Virginia (1784), chapter 22.
Virtual buckeye to Paul Attridge in Facebook, and to Kevin Puffer, his commentor, who supplied the context above.