The most important single effect the book had, was to convert Thomas Clarkson, who thereafter devoted his life to the cause of abolishing the slave trade. While a Senior Bachelor of Arts at the University of Cambridge, Clarkson had in 1784 distinguished himself by winning a prize for the best Latin dissertation. The following year a prize was offered for the best essay on the subject "anne Liceat invitos in servitutem dare," is it lawful to make slaves of others against their will? Knowing that he was then unprepared to compete, he hesitated to enter the contest, not wishing to lose the reputation he had so recently won. Yet owing to the fact that it was expected of him, he entered his name, actuated by no other motive than to distinguish himself as a scholar. As there was then a paucity of literature on slavery in England, his first researches in this field were not productive of gratifying results. "I was in this difficulty," says Clarkson, "when going by accident into a friend's house, I took up a newspaper there lying on the table. One of the first articles which attracted my notice was an advertisement of Anthony Benezet's '_Historical Account of Guinea_.' I soon left my friend and his paper, and, to lose no time, hastened to London to buy it. In this precious book I found almost all I wanted." Clarkson easily won the first prize. Although Benezet himself did not live to see it, this volume converted to the cause of the oppressed race a man who as an author and reformer became one of the greatest champions it ever had.[41] Benezet continued to write on the slave trade, collecting all accessible data from year to year and publishing it whenever he could. He obtained many of his facts about the sufferings of slaves from the Negroes themselves, moving among them in their homes, at the places where they worked, or on the wharves where they stopped when traveling. To diffuse this knowledge where it would be most productive of the desired results, he talked with tourists and corresponded with every influential person whom he could reach. Travelers who came into contact with him were given thoughts to reflect on, messages to convey or tracts to distribute among others who might further the cause. Hearing that Granville Sharp had in 1772 obtained the significant verdict in the famous Somerset case, Benezet wrote him, that this champion of freedom abroad might be enabled to cooperate more successfully with those commonly concerned on this side of the Atlantic.[42] With the same end in view he corresponded with George Whitefield and John Wesley.[43]