A prospect of heaven, or, A treatise of the happiness of the saints in glory : wherein is described the nature and quality, the excellency and certainty of it : together with the circumstances, substance and adjuncts of that glory : the unspeakable misery of those that lose it, and the right way to obtain it : shewing also the disproportion between the saints present sufferings, and their future glory : many weighty questions discussed and divers cases cleered /