On his return he added a part to the treatise before published on the keeping of care which had been growing upon him for some years.
In the year 1762, he printed, published, and distributed this treatise.
In 1767, he went on foot to the western shores of the same province on a religious visit.

After having crossed the Susquehanna, his old feelings returned to him; for coming amongst people living in outward ease and greatness, chiefly on the labour of slaves, his heart was much affected, and he waited with humble resignation to learn how he should further perform his duty to this injured people.

The travelling on foot, though it was agreeable to the state of his mind, he describes to have been wearisome to his body.

He felt himself weakly at times, in consequence of it, but yet continued to travel on.

At one of the quarterly meetings of the society, being in great sorrow and heaviness, and under deep exercise on account of the miseries of the poor Africans, he expressed himself freely to those present, who held them in bondage.