A preservative against unsettled notions, and want of principles, in regard to righteousness and Christian perfection [electronic resource] : An explanatory sermon on that mistaken text be not righteous over-much; neither make thyself over-wife: why shouldst thou destroy thyself? being a more particular answer to Dr. Trapp's four sermons upon the same text, than have yet been publish'd. By George Whitefield A.B. of Pembroke College, Oxford