Opinion, whether well or ill-founded, is the governing principle of human affairs

[In the event of war, Americans would] resort for repose and security to institutions which have a tendency to destroy their civil and political rights. To be more safe they, at length, become willing to run the risk of being less free.

The only constitutional exception to the power of making treaties is, that it shall not change the Constitution.… On natural principles, a treaty, which should manifestly betray or sacrifice primary interests of the state, would be null.

There is no part of the administration of government that requires extensive information and a thorough knowledge of the principles of political economy, so much as the business of taxation. The man who understands those principles best will be least likely to resort to oppressive expedients, or sacrifice any particular class of citizens to the procurement of revenue. It might be demonstrated that the most productive system of finance will always be the least burdensome.

It equally proves, that though individual oppression may now and then proceed from the courts of justice, the general liberty of the people can never be endangered from that quarter; I mean so long as the judiciary remains truly distinct from both the legislature and the Executive. For I agree, that "there is no liberty, if the power of judging be not separated from the legislative and executive powers." And it proves, in the last place, that as liberty can have nothing to fear from the judiciary alone, but would have every thing to fear from its union with either of the other departments.

The laws of certain states . . . give an ownership in the service of Negroes as personal property . . . . But being men, by the laws of God and nature, they were capable of acquiring liberty - and when the captor in war . . . thought fit to give them liberty, the gift was not only valid, but irrevocable.

In politics, as in religion, it is equally absurd to aim at making proselytes by fire and sword. Heresies in either can rarely be cured by persecution.