What did John Locke do that eventually brought him into the center of English political life?

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John Locke became the personal physician and trusted friend of the future Earl of Shaftesbury, and when he successfully performed a liver operation on him, he gained the trust and favor of the influential Shaftesbury. Locke was then brought into the center of English political life as a result of his association with Shaftesbury and his political and philosophical ideas.

What Did John Locke Do That Eventually Brought Him into the Center