John Trithmius...to Henry Cornelius Agrippa... Your work, most renowned Agrippa, entitled Of Occult Philosophy, which you have sent by this bearer to… - Heinrich Cornelius Agrippa

(after writing this book, Agrippa sent it to Trithemius, who after reading the manuscript and then answered Agrippa)

I do not doubt but the title of our book of Occult Philosophy, or of Magic, may by the rarity of it allure many to read it, amongst which, some of a disordered judgment and some that are perverse will come to hear what I can say, who, by their rash ignorance, may take the name of Magic in the worse sense and, though scarce having seen the title, cry out that I teach forbidden Arts, sow the seed of heresies, offend the pious, and scandalize excellent wits; that I am a sorcerer, and superstitious and devilish, who indeed am a Magician: to whom I answer, that a Magician doth not, amongst learned men, signify a sorcerer or one that is superstitious or devilish;' but a wise man, a priest, a prophet that the Sybils were Magicianesses, and therefore prophesied most clearly of Christ; and that Magicians, as wise men, by the wonderful secrets of the world, knew Christ, the author of the world, to be born, and came first of all to worship him; and that the name of Magic was received by philosophers, commended by divines, and is not unacceptable to the Gospel.

If any error have been committed, or any thing hath been spoken more freely, pardon my youth, for I wrote this being scarce a young man, that I may excuse myself, and say, whilst I was a child I spake as a child, and I understood as a child, but being become a man, I retracted those things which I did being a boy, and in my book of the vanity and uncertainty of Sciences I did, for the most part, retract this book But here, haply, you may blame me again, saying, "Behold, thou, being a youth, didst write, and now, being old, hast retracted it; what, therefore, hast thou set forth? " I confess, whilst I was very young, I set upon the writing- of these books, but, hoping that I should set them forth with corrections and enlargements— and for that cause I gave them to Trithemius, a Neapolitanian Abbot... a man very industrious after secret things. But it happened afterwards that, the work being intercepted, before I finished it, it was carried about imperfect and impolished, and did fly abroad in Italy, in France, in Germany, through many men's hands; and some men, whether more impatiently or imprudently I know not, would have put it thus imperfect to the press, with which mischief, I, being affected, determined to set it forth myself, thinking that there might be less danger if these books came out of my hands with some amendments than to come forth, torn and in fragments, out of other men's hands.