This is the last class on Shaar HaYichud V’Emunah and covers chapters 11 and 12. In sum, the Alter Rebbe discussed the concept of Ein Sof and the idea of Sefiros which are lights of the Ein Sof that exist in relation to us. He now continues with a discussion of the letters of creation. The letters affect the detail in the Sefiros of the Ein Sof and the various formations of letters provide the possibility for the creation of a huge, virtually infinite, number of diverse creations. There are letters that are relatively original which are closer to the letters from the ten utterances and letters that are more remote on lower and lower levels all the way down to the levels of the creation that here in our physical world. The world, the letters, and the light are all included one among the other: the world is one with the letters, the letters are one with the light, and the light is included in the source. The worlds therefore continue to be one with G-d.