Thomas Jefferson, through his friendship with Marquis de Lafayette, was heavily influenced by French philosophers of the Age of Enlightenment, such as Voltaire, Rousseau and Montesquieu. In their often censored writings, those philosophers advocated that men were born free and equal. This later led to the French Revolution of 1789 and the concept of Human Rights (Droits de l'Homme in French). At the age of 33, Jefferson may have also borrowed the expression from an Italian friend, born in Prato, and neighbor, Philip Mazzei, as noted by Joint Resolution 175 of the 103rd Congress as well as by John F. Kennedy in "A Nation of Immigrants".