TANYA Iggeret HaTeshuvah Chapter 10 Part Three "Achieving Wellness of Soul" Achieving Emotional Equilibrium; Balancing Joy and Seriousness !
TANYA CHAPTER 35 Part Five Kabbalah Footnote on the Primacy of Deed! (PT 4)
TANYA CHAPTER 38 Part Two ! Do Mindless Mitzvahs = Body without Soul! If one performs a Mitzvah without any concentration, intention or mindfulness...