Do you have a link for that letter somewhere? I’d be interested in reading it.
The relevant quote is here:
"The South, in my opinion, has been aggrieved by the acts of the North, as you say. I feel the aggression, and am willing to take every proper step for redress. It is the principle I contend for, not individual or private gain. As an American citizen, I take great pride in my country, her prosperity and institutions, and would defend any State if her rights were invaded. But I can anticipate p421no greater calamity for the country than a dissolution of the Union. It would be an accumulation of all the evils we complain of, and I am willing to sacrifice everything but honor for its preservation. I hope therefore, that all constitutional means will be exhausted before there is a recourse to force. Secession is nothing but revolution. The framers of our Constitution never exhausted so much labor, wisdom and forbearance in its formation, and surrounded it with so many guards and securities, if it was intended to be broken by every member of the Confederacy at will. It was intended for 'perpetual union' so expressed in the preamble, and for the establishment of a government, not a compact, which can only be dissolved by revolution, or the consent of all the people in convention assembled. It is idle to talk of secession. Anarchy would have been established, and not a government by Washington, Hamilton, Jefferson, Madison, and the other patriots of the Revolution. . . . Still, a Union that can only be maintained by swords and bayonets, and in which strife and civil war are to take the place of brotherly love and kindness, has no charm for me. I shall mourn for my country and for the welfare and progress of mankind. If the Union is dissolved, and the Government disrupted, I shall return to my native State and share the miseries of my people, and save in defence will draw my sword on none."
It can be found in Freeman's biography of Lee Link