Tanya Chapter 20 Part Two The One and Only Eternal One Revealed! Learn the true definition of Hashem Echad (our G-d is One). http://www.chabad.org/library/tanya/tanya_cdo/aid/7899/jewish/Chapter-20.htm
TANYA CHAPTER 27: Part Seven (of Seven) “The Loyalists” Our relationship with HaShem involves mutual commitment and reflexive loyalty.
TANYA Iggeret HaTeshuvah Chapter 11 Part Two G-d’s Endless Mercy, and Infinite Forgiveness!