John Adams on Revolutionary Principles

Here is one source for the quotation.

These are what are called revolution principles. They are the principles of Aristotle and Plato, of Livy and Cicero, and Sidney, Harrington, and Locke; the principles of nature and eternal reason; the principles on which the whole government over us now stands. It is therefore astonishing, if any thing can be so, that writers, who call themselves friends of government, should in this age and country be so inconsistent with themselves, so indiscreet, so immodest, as to insinuate a doubt concerning them.

— John Adams, Novanglus, No. 1.

Hat tip: TVD.