As you justly observe, there is not an idea in it[The Declaration of Independence] but what had been hackneyed in Congress for two years before. The substance of it is contained in the declaration of rights and the violation of those rights in the Journals of Congress in 1774. Indeed, the essence of it is contained in a pamphlet, voted and printed by the town of Boston, before the first Congress met, composed by James Otis, as I suppose, in one of his lucid intervals, and pruned and polished by Samuel Adams.

What It Means

This is a placeholder explanation generated by the low-overhead model. It interprets "As you justly observe, there is not an idea in it[The Declaration of Independence] but what had been hackneyed in Congress for two years before. The substance of it is contained in the declaration of rights and the violation of those rights in the Journals of Congress in 1774. Indeed, the essence of it is contained in a pamphlet, voted and printed by the town of Boston, before the first Congress met, composed by James Otis, as I suppose, in one of his lucid intervals, and pruned and polished by Samuel Adams." in the context of "John Adams to Timothy Pickering, 6 August 1822,https://founders.archives.gov/documents/Adams/99-02-02-7674 pointing out the importance of James Otis' 1763 work The Rights of the British Colonies Asserted and Proved" to mean that wisdom is timeless.