Industry entirely left to itself, would soon fall to ruin, and a nation letting everything alone would commit suicide.

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 concentration and reciprocal effect of industry and agriculture conjoin in a growth of productive powers, which increases more in geometrical than in arithmetical proportion.

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.

It is bad policy to regulate everything... where things may better regulate themselves and can be better promoted by private exertions; but it is no less bad policy to let those things alone which can only be promoted by interfering social power.

Industry entirely left to itself, would soon fall to ruin, and a nation letting everything alone would commit suicide.

Only now did I recognize the reciprocal relationship which exists between manufacturing power and the national system of transportation, and that the one can never develop to its fullest without the other.