evidence: John Adams on the abolition of slavery, 1801 A Spotlight on a Primary Source by John Adams On January 24, 1801, President John Adams responded to two abolitionists who had sent him an anti-slavery pamphlet by Quaker reformer Warner Mifflin (1745–1798). In the letter, Adams expresses his views on slavery, the dangers posed by abolitionists (who at the time were mostly Quakers and unpopular religious radicals), and emancipation. Of slavery Adams writes, "my opinion against it has always been known," noting that he has "always employed freemen both as Domisticks and Labourers, and never in my Life did I own a Slave."