The necessity and divine excellency of a life of purity and holiness : set forth with pathetic energy, by an eminent minister of the Gospel amongst the people called Quakers. In seven discourses and three prayers, and an epistle to his brethren in religious profession in the island of Tortola. Now collected and re-published, that the instructive and important truths therein contained, may be spread and become more generally useful. [One line from John].