This treatise on 1 John 3:3, "And every man that hat this hope in him purifieth himself," first establishes that every believer is a hopeful person; second, explains that where true hope resides, it will purge the heart; and third, provides ten ways in which believers can purify themselves by hope. Burroughs also shows the origin, object, and ground of hope. The book concludes with an exhortation to put away sin. This is a timely, succinct masterpiece for our impure world, lost in sin and full of despair. During his life, Jeremiah Burroughs was loved for his preaching and gentle spirit and was persecuted for his non-conformity ot the Church of England. Forced to flee to Holland and Rotterdam for a time, he eventually returned to England and preached to congregations in Stepney and Cripplegate in London, two of the largest congregations in all of England.