The Barddas of Iolo Morganwg, Vol. I., ed. by J. Williams Ab Ithel, , at sacred-texts.com
Einigan the Giant beheld three pillars of light, having in them all demonstrable sciences that ever were, or ever will be. And he took three rods of the quicken tree, and placed on them the forms and signs of all sciences, so as to be remembered; and exhibited them. But those who saw them misunderstood, and falsely apprehended them, and taught illusive sciences, regarding the rods as a God, whereas they only bore His Name. When Einigan saw this, he was greatly annoyed, and in the intensity of his grief he broke the three rods, nor were others found that contained accurate sciences. He was so distressed on that account that from the intensity he burst asunder, and with his [parting] breath he prayed God that there should be accurate sciences among men in the flesh, and there should be a correct understanding for the proper discernment thereof. And at the end of a year and a day, after the decease of Einigan, Menw, son
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of the Three Shouts, beheld three rods growing out of the mouth of Einigan, which exhibited the sciences of the Ten Letters, and the mode in which all the sciences of language and speech were arranged by them, and in language and speech all distinguishable sciences. He then took the rods, and taught from them the sciences--all, except the Name of God, which he made a secret, lest the Name should be falsely discerned; and hence arose the Secret of the Bardism of the Bards of the Isle of Britain. And God imparted His protection to this secret, and gave Menw a very discreet understanding of sciences under this His protection, which understanding is called Awen from God; and blessed for ever is he who shall obtain it. Amen, so be it.