Main Kabbalistic Sources: The Works of the ARI
Rav Isaac Luria troubled and provided us the fullest measure. He did wondrously more than his predecessors, and if I had a tongue that praises, I would praise that day when his wisdom appeared almost as the day when the Torah [methodology of correction] was given to Israel [those who are willing to correct themselves spiritually].
There are not enough words to measure his holy work in our favor. The doors of attainment were locked and bolted, and he came and opened them for us. …
You find a thirty-eight-year-old who subdued with his wisdom all his predecessors through the Genius and through all times. All the elders of the land, the gallant shepherds, friends, and disciples of the Godly sage, the RAMAK, stood before him as disciples before the Rav.
All the sages of the generations following them to this day, none missing, have abandoned all the books and compositions that precede him, the Kabbalah of the RAMAK, the Kabbalah of The First and the Kabbalah of The Genius [those who lived and worked prior to ARI], blessed be the memory of them all. They have attached their spiritual life entirely and solely to his Holy Wisdom.
– Baal HaSulam, “Introduction to the Book, Panim Meirot uMasbirot”