The concentration and reciprocal effect of industry and agriculture conjoin in a growth of productive powers, which increases more in geometrical than in arithmetical proportion.
Only now did I recognize the reciprocal relationship which exits between manufacturing power and the national system of transportation, and that the one can never develop to its fullest without the other.
But the general welfare must restrict and regulate the exertions of the individuals, as the individuals must derive a supply of their strength from social power.
An individual, in promoting his own interest, may injure the public interest; a nation, in promoting the general welfare, may check the interest of a part of its members.
The more a person learns how to use the forces of nature for his own purposes, by means of perfecting the sciences and the invention and improvement of machines, the more he will produce.