By the end of the eighteenth century, Locke's influence on educational thought was widely acknowledged. In 1772 James Whitchurch wrote in his "Essay Upon Education" that Locke was "an Author, to whom the Learned must ever acknowledge themselves highly indebted, and whose Name can never be mentioned without a secret Veneration, and Respect; his Assertions being the result of intense Thought, strict Enquiry, a clear and penetrating Judgment." Writers as politically dissimilar as Sarah Trimmer, in her periodical "The Guardian of Education" (1802–06), and Maria Edgeworth, in the educational treatise she penned with her father, "Practical Education" (1798), invoked Locke's ideas. Even Rousseau, while disputing Locke's central claim that parents should treat their children as rational beings, acknowledged his debt to Locke.