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I heard from some people that the Vilna Goyn wrote a letter saying that if one doesn't learn Zoyhar, he shouldn't render decisions about Jewish law; where can we look to find this letter?
I haven't seen any quote from the GR"A that states that one shouldn't paskin, but he speaks about the importance of learning Kabbalah in Even Shleimah in 8,24 and 11,3 and in his commentary to Mishlei in 5,18