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6 this, in 1671, when the “Five or six friends” that met for discourse on subjects of mutual interest found themselves suddenly face to face with problems touching the character of the human mind. The discussions that followed led to the beginning of Locke's greatest work, the “Essay concerning the human Understanding.” An account of how the Essay came to be written is given by the author in the introductory “Epistle to the Reader.”

The condition of Locke's health about this time suggested a trip to the Continent. After a few months, however, Lord Ashley, recently created Earl of Shaftesbury, being appointed Lord High Chancellor of the realm, called Locke home to act as his advisor as well as to fill the offices of Secretary of Presentations and Secretary to the Council of Trade and Plantations. It was not long before Shaftesbury incurred the displeasure of the king, and with his fall Locke too stepped out of public office. The freedom from public responsibility gave him the opportunity for doing again what the state of his health demanded. This time he took up his residence at Montpellier in France, where he remained until 1679, in which year, Shaftesbury being restored, Locke returned to England. But he was now destined to share the fortunes of his patron, who, being discovered in 1682 in a plot against the king, fled to Holland, whither he was soon followed by Locke. This land of tolerance was the home of the philosopher until his return to England with the Princess Mary in 1689.

During these years in Holland he was free to think and study as he never would have been in England. Always eager to exchange his thoughts with other men,