From the Introduction to His Father’s Book, Noda bi-Yehudah

I truly heard a mouth of holiness uttering these words, namely the holy and honored one of the Almighty, the most renowned, illustrious, saintly, and godly kabbalist, our teacher, R. ḥayim of Sanz of blessed memory, whom we know to have been a worthy companion to him in the study of the secret lore of the Almighty. He used to say that all the sacred writings of the Ari [R. Isaac Luria] of blessed memory, and the other works of Kabbalah which are accepted as authoritative in this country, and also the Guide for the Perplexed, were collated together by the Noda bi-Yehudah, and permanently concealed beneath the shelter of his wings; and the other members of the local kloyz—who were the elders in that generation—exaggerated in similar vein, claiming that they had experienced the mystical visions of Ezekiel in those days.