Tanya for the 8th of Tishrei ח' תשרי

All the multitude and diverse created beings (Yesh) come into existence through the “letters” of Malchus of Atzilus, which is known as “the mouth of the L-rd,” for it is in Malchus of Atzilus that the energy of Ein Sof manifests. The process of creation that originates from Malchus of Atzilus is termed “birth.”