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