and forbearance. As parties to the compact which constitutes the Union, they are under obligations to observe its provisions, and prevent their infraction. In exercising the right in question, they are bound to take special care that they do not themselves, violate this, the most sacred of obligations. To avoid this, prudence and propriety require that they should abstain from interposing their authority, to arrest an act of their common government, unless the case, in their opinion, involve a clear and palpable infraction of the instrument. They are bound to go further — and to forbear from interposing, even when it is clear and palpable, unless it be, at the same time, highly dangerous in its character, and apparently admitting of no other remedy; and for the plain reason, that prudence and propriety require, that a right so high and delicate should be called into exercise, only in cases of great magnitude and extreme urgency. But even when, in the opinion of the people of a State, such a case has occurred — that nothing, short of the interposition of their authority, can arrest the danger and preserve the constitution, they ought to interpose in good faith — not to weaken or destroy the Union, but to uphold and preserve it, by causing the instrument on which it rests, to be observed and respected; and to this end, the mode and measure of redress ought to be exclusively directed and limited. In such a case, a State not only has the right, but is, in duty to itself and the Union, bound to interpose — as the last resort, to arrest the dangerous infraction of the
