He by and large, without a doubt, neither means to advance the public interest, nor knows amount he is advancing it. By favoring the help of homegrown to that of unfamiliar industry means just his own security; and by coordinating that industry in such a way as its produce of the best worth, he expects just his own benefit, and he is in this, as in numerous differer drove by an undetectable hand to advance an end which was no essential for his goal. Nor generally the more awful for the general public that it was no essential for it. By chasing aft advantage he oftentimes advances that of the general public more efficaciously than when plans to advance it.[57]