A Preservative in Perilous Times. In three letters. I. To Mr. James Relly, relative to his misleading principles in religion. II. To Mr. John Wesley, occasion'd by the revival of his Dialogues, in a late treatise, called, A Preservative against Unsettled Notions. III. To Mr. John Wesley, occasion'd by his letter of remarks on Theron and Aspasio [i.e. the work by James Hervey], publish'd in the above-mention'd Preservative