In the year 1757, he felt his mind so deeply interested on the same subject, that he resolved to travel over Maryland, Virginia, and North Carolina, in order to try to convince persons, principally in his own Society, of the inconsistency of holding slaves. He joined his brother with him in this arduous service. Having passed the Susquehanna into Maryland, he began to experience great agitation of mind. "Soon after I entered this province," says he, "a deep and painful exercise came upon me, which I often had some feeling of since my mind was drawn towards these parts, and with which I had acquainted my brother, before we agreed to join as companions. "As the people in this and the southern provinces live much on the labour of slaves, many of whom are used hardly, my concern was that I might attend with singleness of heart to the voice of the true Shepherd, and be so supported, as to remain unmoved at the faces of men." It is impossible for me to follow him in detail, through this long and interesting journey, when I consider the bounds I have prescribed to myself in this work. I shall say therefore, what I purpose to offer generally and in a few words. It appears that he conversed with persons occasionally, who were not of his own Society, with a view of answering their arguments, and of endeavouring to evince the wickedness and impolicy of slavery. In discoursing with these, however strenuous he might appear, he seems never to have departed from a calm, modest, and yet dignified and even friendly demeanour. At the public meetings for discipline, held by his own Society in these provinces, he endeavoured to display the same truths and in the same manner, but particularly to the elders of his own Society, exhorting them, as the most conspicuous rank, to be careful of their conduct, and to give a bright example in the liberation of their slaves. He visited also families for the same purpose: and he had the well-earned satisfaction of finding his admonitions kindly received by some, and of seeing a disposition in others to follow the advice he had given them.