At every turn, the struggle for equality was resisted by many of the powerful. And some have said we should not judge their failures by the standards of a later time, yet in every time there were men and women who clearly saw this sin and called it by name. We can fairly judge the past by the standards of President John Adams, who called slavery 'an evil of colossal magnitude'. We can discern eternal standards in the deeds of William Wilberforce and John Quincy Adams and Harriet Beecher Stowe and Abraham Lincoln. These men and women, black and white, burned with a zeal for freedom and they left behind a different and better nation. Their moral vision caused Americans to examine our hearts, to correct our Constitution and to teach our children the dignity and equality of every person of every race.