Isserles is perhaps best known for his halakhic works, chief among them his notes to the Shulchan Aruch by Yosef Karo.
Isserles, like Yosef Karo in the Shulchan Aruch, often quotes Kabbalistic sources and opinions in his various works, and writes of his great joy upon finding that his ruling concurred with what he later found written in the "words of the Zohar which were given at Sinai.." [REF].