Advice to pious Christians in times of schism and apostasy; Containing, I. Considerations upon a Question, viz. What is a Christian to do, who goes into a Country where the Clergy is unwarrantable, or the Worship corrupt, or both? II. A more particular Consideration of their Case, who are deprived of the Benefit of Canonical Ministers, to administer the Sacraments, and discharge other Ministerial Offices among them. With a letter to a friend upon the same subject.