The Philosophy of Natural Magic, by Henry Cornelius Agrippa, L. W. de Laurence ed. , at sacred-texts.com
John Trithemius, Abbot of Saint James of Herbipolis, Formerly of Spanhemia, to his Henry Cornelius Agrippa of Nettesheim, Health and Love:
Your work, most renowned Agrippa, entitled Of Occult Philosophy, which you have sent by this bearer to me, has been examined. With how much pleasure I received it no mortal tongue can express nor the pen of any write. I wondered at your more than vulgar learning—that you, being so young, should penetrate into such secrets as have been hid from most learned men; and not only clearly and truly but also properly and elegantly set them forth. Whence first I give you thanks for your good will to me, and, if I shall ever be able, I shall return you thanks to the utmost of my power. Your work, which no learned man can sufficiently commend, I approve of. Now that you may proceed toward higher things, as you have begun, and not suffer such excellent parts of wit to be idle, I do, with as much earnestness as I can, advise, intreat and beseech you that you would exercise yourself in laboring after better things, and demonstrate the light of true wisdom to the ignorant, according as you yourself are divinely enlightened. Neither let the consideration of idle, vain fellows withdraw you from your purpose; I say of them, of whom it is said, "The wearied ox treads hard," whereas no man, to the judgment of the wise, can be truly learned who is sworn to the rudiments of one only faculty. But you have been by God gifted with a large and sublime wit, and it is not that you should imitate oxen but rather birds; neither think it sufficient that you study about particulars, but
bend your mind confidently to universals; for by so much the more learned any one is thought, by how much fewer things he is ignorant of. Moreover, your wit is fully apt to all things, and to be rationally employed, not in a few or low things, but many and sublimer. Yet this one rule I advise you to observe—that you communicate vulgar secrets to vulgar friends, but higher and secret to higher and secret friends only: Give hay to an ox, sugar to a parrot only. Understand my meaning, lest you be trod under the oxen's feet, as oftentimes it falls out. Farewell, my happy friend, and if it lie in my power to serve you, command me, and according to your pleasure it shall without delay be done; also, let our friendship increase daily; write often to me, and send me some of your labors I earnestly pray you. Again farewell.
From our Monastery of Peapolis, the 8th day of April, A. D. MDX.
In January, 1531, Agrippa wrote from Mechlin to Hermann of Wied, Archbishop of Cologne, to whom he dedicated his Occult Philosophy. In this letter he says: "Behold! amongst such things as were closely laid up—the books Of Occult Philosophy, or of Magic," "a new work of most ancient and abstruse learning;" "a doctrine of antiquity, by none, I dare say, hitherto attempted to be restored." "I shall be devotedly yours if these studies of my youth shall by the authority of your greatness come into knowledge," "seeing many things in them seemed to me, being older, as most profitable, so most necessary to be known. You have therefore the work, not only of my youth but of my present age," "having added many things."
The etching inserted at this place is made from the title page of the only complete English edition of the Occult Philosophy of Magic heretofore published.