Locke's influence during the American Revolutionary period is disputed. While it is easy to point to specific instances of Locke's "Two Treatises" being invoked, the extent of the acceptance of Locke's ideals and the role they played in the American Revolution are far from clear. The "Two Treatises" are echoed in phrases in the Declaration of Independence and writings by Samuel Adams that attempted to gain support for the rebellion. Of Locke's influence Thomas Jefferson wrote: "Bacon, Locke and Newton I consider them as the three greatest men that have ever lived, without any exception, and as having laid the foundation of those superstructures which have been raised in the Physical & Moral sciences". The colonists frequently cited Blackstone's "Commentaries on the Laws of England", which synthesised Lockean political philosophy with the common law tradition. Louis Hartz, writing at the beginning of the 20th century, took it for granted that Locke was the political philosopher of the revolution.