The inconsistency of the ...

The inconsistency of the institution of domestic slavery with the principles of the Declaration of Independence was seen and lamented . . . no insincerity or hypocrisy can be fairly laid to their charge. Never from their lips was heard one syllable of attempt to justify the institution of slavery. They universally considered it as a reproach fastened upon them by the unnatural step-mother country and they saw that before the principles of the Declaration of Independence slavery, in common with every other mode of oppression, was destined sooner or later to be banished from the earth.
 John Quincy Adams

Quotes from the same author

If your actions inspire others to dream more, learn more, do more and become more, you are a leader.
 John Quincy Adams
I am a warrior, so that my son may be a merchant, so that his son may be a poet.
 John Quincy Adams
All men profess honesty as long as they can. To believe all men honest would be folly. To believe none so is something worse.
 John Quincy Adams
Why is it that, next to the birthday of the Savior of the world, your most joyous and most venerated festival returns on this day (the 4th of July)? Is it not that, in the chain of human events, the birthday of the nation is indissolubly linked with the birthday of the Savior?.
 John Quincy Adams
We have no government armed with power capable of contending with human passions unbridled by morality and religion. Our constitution was made for a moral and religious people... it is wholly inadequate to the government of any other.
 John Quincy Adams