John C. Calhoun said this quote

The day that the balance between the two sections of the country - the slaveholding States and the non-slaveholding States - is destroyed is a day that will not be far removed from political revolution, anarchy, civil war, and widespread disaster.

~ John C. Calhoun

When we contend, let us contend for all our rights - the doubtful and the certain, the unimportant and essential. It is as easy to contend, or even more so, for the whole as for a part. At the termination of the contest, secure all that our wisdom and valour and the fortune of war will permit.

~ John C. Calhoun

I am aware how difficult is the task to preserve free institutions over so wide a space and so immense a population, but we are blessed with a Constitution admirably calculated to accomplish it. Its elastic power is unequaled, which is to be attributed to its federal character.

~ John C. Calhoun

What we want, above all things on earth in our public men, is independence. It is one great defect in the character of the public men of America that there is that real want of independence; and, in this respect, a most marked contrast exists between public men in this country and in Great Britain.

~ John C. Calhoun