4. Others there are who are grown obstinate in their minds and wills, concerning Spirits, Apparitions, Witchcraft, Sorcery, Inchantment, and the like, and are grown pertinacious and resolute to stick to and hold those opinions that they have imbibed through ignorant education: not considering that perseverance in a good cause, and well grounded opinion is laudable and commendable, but pertinaciousness in a bad and ill grounded tenent, is as bad and hurtful. And it is every wise mans duty to study the cultivation and improvement of the goods of the mind, and never to be ashamed to learn that of which they were ignorant before. For the minds of men are not only darkned in the fall of _Adam_, but also much misled, by the sucking in of errors in their younger and more unwary years, from whence they ought to endeavour with might and main to extricate and deliver themselves. But he that is wilfully setled upon the lees and dregs of former opinions, though never so erroneous, hath shut forth all further light from shining into his understanding, and so is become wilfully blind. To such as these we shall only propose the example and practice of the Apostle, who saith: _When I was a child, I spake as a child, I understood as a child, I thought as a child: But when I became a man, I put away childish things_. And I advise them not to refuse the counsel of _S. Augustine_, who saith: _Ad discendum quod opus est, nulla ætas sera videri potest: quia etsi senes magis decet, docere quam discere; magis tamen decet discere, quam ignorare_. And they need not be ashamed to imitate _Socrates_, who did wax old every day learning something. 5. As we have not intended this Treatise, and Introduction for such conditioned persons as we have enumerated before, so there are others to whom we freely offer and present it, and shall shew the grounds and causes that moved us to undertake such a mysterious, and dangerous subject. And those are such as have an humble, lowly, and equal mind, that they commonly read Books to be informed, and to learn those truths of which they are ignorant, or to be confirmed in those things they partly knew before. It is to such as these only that we offer our labours, and therefore shall candidly declare unto them the causes and reasons of our undertaking which are these.