The inner, subtle essences can be contemplated only by sucking, not by knowing.

Isaac the Blind (twelfth-thirteenth centuries), Commentary on Sefer Yetsirah, ed. Gershom Scholem, Ha-Qabbalah be-Provans (Jerusalem: Akademon, 1970) in The Essential Kabbalah, The Heart of Jewish Mysticism, Daniel C. Matt, HarperCollins, 1995

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