State inspection laws, health laws, and laws for regulating the internal commerce of a State, and those which respect turnpike roads, ferries, &c. are not within the power granted to Congress. ... Inspection laws, quarantine laws, health laws of every description, as well as laws for regulating the internal commerce of a State, and those which respect turnpike roads, ferries, &c., are component parts of this mass. No direct general power over these objects is granted to Congress, and, consequently, they remain subject to State legislation.

A legislative act contrary to the Constitution is not law.

No principle of general law is more universally acknowledged, than the perfect equality of nations. Russia and Geneva have equal rights. It results from this equality, that no one can rightfully impose a rule on another....As no nation can prescribe a rule for others, none can make a law of nations.

To listen well is as powerful a means of communication and influence as to talk well

What is it that makes us trust our judges? Their independence in office and manner of appointment.

The most lively fancy aided by the strongest description cannot equal the reality of the opera.

The government of the United States has been emphatically termed a government of laws, and not of men. It will certainly cease to deserve this high appellation, if the laws furnish no remedy for the violation of a vested legal right.