How Magicians Collect Virtues from the Three-fold World, is Declared in these Three Books. Seeing there is a Three-fold World: Elementary, Celestial … - Heinrich Cornelius Agrippa

I confess that Magic teacheth many superfluous things, and curious prodigies for ostentation; leave them as empty things, yet be not ignorant of their causes. But those things which are for the profit of men — for the turning away of evil events, for the destroying of sorceries, for the curing of diseases, for the exterminating of phantasms, for the preserving of life, honor, or fortune—may be done without offense to God or injury to religion, because they are, as profitable, so necessary.

The supercilious censors will object against the Sybils, holy Magicians and the Gospel itself sooner than receive the name of Magic into favor. So conscientious are they that neither Apollo nor all the Muses, nor an angel from heaven can redeem me from their curse. Whom therefore I advise that they read not our writings, nor understand them, nor remember them. For they are pernicious and full of poison; the gate of Acheron is in this book; it speaks stones—let them take heed that it beat not out their brains. But you that come without prejudice to read it, if you have so much discretion of prudence as bees have in gathering- honey, read securely, and believe that you shall receive no little profit, and much pleasure; but if you shall find any things that may not please you, let them alone and make no use of them, for I do not approve of them, but declare them to you. But do not refuse other things, for they that look into the books of physicians do, together with antidotes and medicines, read also of poisons,

Moreover, I thought it no crime if I should not suffer the testimony of my youth to perish! Also, we have added some chapters and inserted many things which did seem unfit to pass by, which the curious reader shall be able to understand by the inequality of the very phrase, for we were unwilling to begin the work anew and to unravel all that we had done, but to correct it and put some flourish upon it. Wherefore, I pray thee, courteous reader, weigh not these things according to the present time of setting them forth, but pardon my curious youth if thou find any thing in them that may displease thee.