The necessity of holding fast the truth : represented in three sermons on Rev. III. 3. Preached at New-York, April 1742. : With an appendix, relating to errors lately vented by some Moravians in those parts. : To which are added, a sermon on the priestly-office of Christ, and another, on the virtue of charity. : Together with a sermon of a Dutch divine on taking the little foxes; faithfully translated. /