Donne says:
But let your study be rather to live according to that religion which you have, than to inquire into that from which God hath delivered you [he means Roman Catholicism]; for that is the looking back of Lot’s wife, and the distemper and distaste of the children of Israel, who remembered too much the Egyptian diet. If you will inquire whether any of the fathers of the primitive church did at any time pray for any of the dead, you shall be told (and truly) that Augustine did, that Ambrose did; but you shall not so presently be told how they deprehended [detected] themselves in an infirmity, and collected and corrected themselves ever when they were so praying. If you inquire whether any of them speak of purgatory, you shall easily find they do; but not so easily, in what sense; when they call the calamities of this life, or when they call the general conflagration of the world, purgatory. If you inquire after indulgences, you may find the name frequent amongst them; but not so easily find when and how the relaxations of penances publicly enjoined, were called indulgences: nor how, nor when, indulgences came to be applied to souls departed.
If thou enquire without a meliusinquirendum, without a thorough inquisition (which is not easy for any man who makes it not his whole study and profession) thou mayest come to think holy men have prayed for the dead, why may not I? Holy men speak of purgatory and indulgences, why should I abhor the names or the things? And so thou mayest fall into the first snare, it hath been done, therefore it may be done; and into another after, it may be done, therefore it must be done: when thou art come to think that some men are saved that have done it, thou wilt think that no man can be saved except he do it: from making infirmities excusable necessary (which is the bondage the council of Trent hath laid upon the world) to make problematical things, dogmatical; and matter of disputation, matter of faith;