MS Vatican, ebr. 456, fol. 4a

Jewish Mysticism
Therefore he who learns all of the thirty-two and thirteen names by heart (‘al peh) … and he knows how to mention them with his mouth can see that their being mentioned when they are read orally is affirmed, for they are one word in the pattern of the essential name, for this demonstrates that they are all contained in the essential name, which is one word … It follows that just as the essential name, which is one word, attests the essence of the unity of the ten sefirot and ’ein sof, so these thirty-two and thirteen names that comes from it attest to the ten sefirot and ’ein sof.”

Translated by Elliot Wolfson in “Megillat ‘Emet we-‘Emunah- Contemplative Visualization and Mystical Unknowing,” Kabbalah- A Journal for the Study of Jewish Mystical Texts 5 (2000)- 55-110.