MR. CLAY:--"As to the personal part of the speech of the senator from South Carolina, I must take the occasion to say that no man is more sincerely anxious to avoid all personal controversy than myself. And I may confidently appeal to the whole course of my life for the confirmation of that disposition. No man cherishes less than I do feelings of resentment; none forgets or forgives an injury sooner than I do. The duty which I had to perform in animadverting upon the public conduct and course of the senator from South Carolina was painful in the extreme; but it was, nevertheless, a public duty; and I shrink from the performance of no duty required at my hands by my country. It was painful, because I had long served in the public councils with the senator from South Carolina, admired his genius, and for a great while had been upon terms of intimacy with him. Throughout my whole acquaintance with him, I have constantly struggled to think well of him, and to ascribe to him public virtues. Even after his famous summerset at the extra session, on more than one occasion I defended his motives when he was assailed; and insisted that it was uncharitable to attribute to him others than those which he himself avowed. This I continued to do, until I read this most extraordinary and exceptionable letter: [Here Mr. Clay held up and exhibited to the Senate the Edgefield letter, dated at Fort Hill, November 3, 1837:] a letter of which I cannot speak in merited terms, without a departure from the respect which I owe to the Senate and to myself. When I read that letter, sir, its unblushing avowals, and its unjust reproaches cast upon my friends and myself, I was most reluctantly compelled to change my opinion of the honorable senator from South Carolina. One so distinguished as he is, cannot expect to be indulged with speaking as he pleases of others, without a reciprocal privilege. He cannot suppose that he may set to the right or the left, cut in and out, and _chasse_, among principles and parties as often as he pleases, without animadversion. I did, indeed, understand the senator to say, in his former speech, that we, the whigs, were unwise and _unpatriotic_ in not uniting with him in supporting the bill under consideration. But in that Edgefield letter, among the motives which he assigns for leaving us, I understand him to declare that he could not 'back and sustain those in such opposition, in whose wisdom, firmness, and patriotism, I have no reason to confide.' "After having written and published to the world such a letter as that, and after what has fallen from the senator, in the progress of this debate, towards my political friends, does he imagine that he can persuade himself and the country that he really occupies, on this occasion, a defensive attitude? In that letter he says: