Source: 1990s, For Cause and Comrades: Why Men Fought in the Civil War (1997), p. 106 
Context: These soldiers were using the word slavery in the same way that Americans in 1776 had used it to describe their subordination to Britain. Unlike many slaveholders in the age of Thomas Jefferson, Confederate soldiers from slaveholding families expressed no feelings of embarrassment or inconsistency in fighting for their own liberty while holding other people in slavery. Indeed, white supremacy and the right of property in slaves were at the core of the ideology for which Confederate soldiers fought.
                                    
“Now while I think as badly of slavery as Horace Greeley did I am not ashamed that my family were slaveholders. It was our inheritance.”
            Neither am I ashamed that my ancestors were pirates and cattle thieves. People must be judged by the standard of their own age. If it was right to own slaves as property it was right to fight for it. 
Letter to Samuel "Sam" Chapman (June 1907)
        
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John S. Mosby 14
Confederate Army officer 1833–1916Related quotes
                                        
                                        As quoted in  His Brother's Blood: Speeches and Writings, 1838–64 https://books.google.com/books?id=qMEv8DNXVbIC&pg=PA193&lpg=PA199 (2004), edited by William Frederick Moore and Jane Ann Moore, p. 199 
1860s, Speech to the U.S. House of Representatives (April 1860)
                                    
2010s, 2015, Presidential Bid Announcement (June 16, 2015)
                                        
                                        Letter to Samuel "Sam" Chapman (June 1907) 
Context: Mason and Hunter not only voted against the admission of California (1850) as a free state but offered a protest against it which the Senate refused to record on its Journal, nor in the Convention which General Taylor had called to from a Constitution for California, there were 52 northern and 50 southern men, but it was unanimous against slavery. But, the Virginia senator, with Ron Tucker & Co. were opposed to giving local self-government to California. Ask Sam Yost to give Christian a skinning. I am not ashamed of having fought on the side of slavery, a soldier fights for his country, right or wrong, he is not responsible for the political merits of the course he fights in. The South was my country.
                                    
"No Compromise with the Evil of Slavery" (1854) essay http://etc.usf.edu/lit2go/185/civil-rights-and-conflict-in-the-united-states-selected-speeches/5061/no-compromise-with-the-evil-of-slavery-speech-1854/
“I think I am doing my works to link myself, my family, with society — with the cosmos.”
                                        
                                        Conversations with History interview (1999) 
Context: I think I am doing my works to link myself, my family, with society — with the cosmos. To link me with my family to the cosmos, that is easy, because all literature has some mystic tendency. So when we write about our family, we can link ourselves to the cosmos.
                                    
“I don't know who my parents were. I know nothing about my inheritance.”
                                        
                                        Academy of Achievement interview (1991) 
Context: I don't know who my parents were. I know nothing about my inheritance. I could be Jewish; I could be part Negro; I could be Irish; I could be Russian. I am spiritually a mix anyway, but I did have a solid childhood fortunately, because of some wonderful women who brought me up. I never had a father or a man in the house, and that was a loss, but you live with that loss.
                                    
1860s, The Constitution of the United States: Is It Pro-Slavery or Anti-Slavery? (1860)