The fact is, that our Union rests upon public opinion, and can never be cemented by the blood of its citizens shed in civil war. If it cannot live in the affections of the people, it must one day perish. Congress possesses many means of preserving it by conciliation; but the sword was not placed in their hand to preserve it by force.

But may I be permitted solemnly to invoke my countrymen to pause and deliberate, before they determine to destroy this, the grandest temple which has ever been dedicated to human freedom since the world began. It has been consecrated by the blood of our fathers, by the glories of the past, and by the hopes of the future. The Union has already made us the most prosperous, and ere long will, if preserved, render us the most powerful nation on the face of the earth. In every foreign region of the globe the title of American citizen is held in the highest respect, and when pronounced in a foreign land it causes the hearts of our countrymen to swell with honest pride. Surely, when we reach the brink of the yawning abyss, we shall recoil with horror from the last fatal plunge.

By such a dread catastrophe, the hopes of the friends of freedom throughout the world would be destroyed, and a long night of leaden despotism would enshroud the nations. Our example for more than eighty years would not only be lost, but it would be quoted as conclusive proof that man is unfit for self-government.

It is not every wrong—nay, it is not every grievous wrong—which can justify a resort to such a fearful alternative. This ought to be the last desperate remedy of a despairing people, after every other constitutional means of conciliation had been exhausted. We should reflect that, under this free Government, there is an incessant ebb and flow in public opinion. The slavery question, like everything human, will have its day. I firmly believe that it has reached and passed the culminating point. But if, in the midst of the existing excitement, the Union shall perish, the evil may then become irreparable.

Congress can contribute much to avert it, by proposing and recommending to the legislatures of the several States the remedy for existing evils which the Constitution has itself provided for its own preservation. This has been tried at different critical periods of our history, and always with eminent success. It is to be found in the fifth article, providing for its own amendment. Under this article, amendments have been proposed by two-thirds of both Houses of Congress, and have been “ratified by the legislatures of three-fourths of the several States,” and have consequently become parts of the Constitution. To this process the country is indebted for the clause prohibiting Congress from passing any law respecting an establishment of religion, or abridging the freedom of speech or of the press, or of the right of petition. To this we are, also, indebted for the Bill of Rights, which secures the people against any abuse of power by the Federal Government. Such were the apprehensions justly entertained by the friends of State rights at that period as to have rendered it extremely doubtful whether the Constitution could have long survived without those amendments.

Again, the Constitution was amended by the same process, after the election of President Jefferson by the House of Representatives, in February, 1803. This amendment was rendered necessary to prevent a recurrence of the dangers which had seriously threatened the existence of the Government during the pendency of that election. The article for its own amendment was intended to secure the amicable adjustment of conflicting constitutional questions like the present, which might arise between the governments of the States and that of the United States. This appears from contemporaneous history. In this connection, I shall merely call attention to a few sentences in Mr. Madison’s justly celebrated report, in 1799, to the legislature of Virginia. In this, he ably and conclusively defended the resolutions of the preceding legislature, against the strictures of several other State legislatures. These were mainly founded upon the protest of the Virginia legislature against the “alien and sedition acts,” as “palpable and alarming infractions of the Constitution.” In pointing out the peaceful and constitutional remedies—and he referred to none other—to which the States were authorized to resort on such occasions, he concludes by saying, “that the legislatures of the States might have made a direct representation to Congress, with a view to obtain a rescinding of the two offensive acts, or they might have represented to their respective Senators in Congress, their wish that two-thirds thereof would propose an explanatory amendment to the Constitution, or two-thirds of themselves, if such had been their option, might by an application to Congress, have obtained a convention for the same object.” This is the very course which I earnestly recommend, in order to obtain an “explanatory amendment” of the Constitution on the subject of slavery. This might originate with Congress or the State legislatures, as may be deemed most advisable to attain the object.

The explanatory amendment might be confined to the final settlement of the true construction of the Constitution on three special points:

1. An express recognition of the right of property in slaves in the States where it now exists or may hereafter exist.

2. The duty of protecting this right in all the common Territories throughout their Territorial existence, and until they shall be admitted as States into the Union, with or without slavery, as their constitutions may prescribe.

3. A like recognition of the right of the master to have his slave, who has escaped from one State to another, restored and “delivered up” to him, and of the validity of the fugitive slave law enacted for this purpose, together with a declaration that all State laws impairing or defeating this right, are violations of the Constitution, and are consequently null and void. It may be objected that this construction of the Constitution has already been settled by the Supreme Court of the United States, and what more ought to be required? The answer is, that a very large proportion of the people of the United States still contest the correctness of this decision, and never will cease from agitation, and admit its binding force, until clearly established by the people of the several States in their sovereign character. Such an explanatory amendment would, it is believed, forever terminate the existing dissensions, and restore peace and harmony among the States.