In Chapter 6 of Frédéric Bastiat‘s indispensable collection entitled Economic Sophisms Bastiat (original emphasis):

The truth is that we should reverse the principle of the balance of trade and calculate the national profit from foreign trade in terms of the excess of imports over exports. This excess, minus expenses, constitutes the real profit. But this theory, which is the correct one, leads directly to the principle of free trade. I present this theory to you, gentlemen, just as I do all the others that have been the subjects of the preceding chapters. Exaggerate it as much as you wish; it has nothing to fear from that test. Assume, if it amuses you, that foreigners flood our shores with all kinds of useful goods, without asking anything from us; even if our imports are infinite and our exports nothing, I defy you to prove to me that we should be the poorer for it.