The second level that is Kodesh is Chochma. This shiur explains why Chochma is part of Ein sof and not Atzilus, by quoting a small section of the Ayin beis on the two types of Ain Zulusecha: Keser and Chochma. Page 506-7, NEW SV p. 666-8. Note: this class can really be listened to as an introduction to the entire discusson of Aliya from Tehora to Kedusha (that started with class 354).
