The three-volume set from Schell includes:
1) The Fate of the Earth
2) The Abolition
3) The Unconquerable World - read free on archive.org
On page 513, the excerpt reads:
The decisive revolution, according to Adams, was thus the process by which ordinary people withdrew cooperation from the British government and then, well before even the Declaration of Independence, set up their own governments in all the colonies. The war that followed was the military defense of these already-existing governments against an attack by what was now a foreign power seeking to force the new country back into its empire. In his view, indeed, independence was nothing that could be won from the British; it had to be forged by the Americans. "Let me ask you, Mr. Rush," he wrote to his friend Richard Rush in April of 1815, in phrases that startlingly resemble Gandhi's later denial that Indian independence could be "given" her by England, "is the sovereignty of this nation a gift? a grant? a concession? a conveyance? or a release and acquittance from Great Britain? Pause here and think. No! The people, in 1774, by the right which nature and nature's God had given them, confiding in original right, assumed powers of sovereignty. In 1775, they assumed greater power. In July 4th, 1776, they assumed absolute unlimited sovereignty in relation to other nations, in all cases whatsoever; no longer acknowledging any authority over them but that of God almighty, and the laws of nature and of nations."
A page prior, Schell writes of Adams's letter to Thomas Jefferson:
To his correspondent, Thomas Jefferson, a former political antagonist, he made the point emphatically: "As to the history of the revolution, my ideas may be peculiar, perhaps singular. What do we mean by the revolution? The war? That was no part of the revolution; it was only an effect and consequence of it. The revolution was in the minds of the people, and this was effected from 1760 to 1775, in the course of fifteen years, before a drop of blood was shed at Lexington."