Torah: 1) To reveal the Ein Sof in this world we need Yetzias Mitzrayim first, 2) It is the very Essence of the Ein Sof that cannot be Tzimtzumed, 3) It manifests emphatically in physical things (like a seed), 4) It takes a Koach to bring it down.
Page 622-3, NEW SV p. 688-90. MP3