Locke had the greatest direct influence. For example, Jefferson adapted the phrase 'life, liberty, and the pursuit of happiness' from Locke's 'Two Treatises on Government.' Montesquieu's book 'The Spirit of the Laws' had more influence on the U.S. Constitution, because it described the checks and balances of having three branches of government.
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The English philosophers John Locke, Rousseau, and Montesquieu.
Ideas they had written about influence the author of the declaration
The Declaration of Independence
Physically, they used a quill pen. If you mean what was their inspiration, then it was philosophers John Locke, Jean-Jacques Rousseau and Montesquieu.
Jefferson got his inspiration for the Declaration of Independence primarily from British political philosopher John Locke, who stated that men are born equal and endowed with natural rights. Jean-Jacques Rousseau was another significant influence; he set forth the theory of the "social contract" in which the government derives its right to rule only from the consent of the governed. Jefferson declared also that the French philosopher Montesquieu was a major influence.