TANYA CHAPTER 27 Part One "A Frum Frown" Why meticulous observance might induce depression, and how you can to turn it into joy!
TANYA: CHAPTER 28 Part Two "Focus on Davening: Why mind-wandering weirdness during Davening actually proves nothing!
TANYA CHAPTER 19: PART THREE http://www.chabad.org/library/tanya/tanya_cdo/aid/7898/jewish/Chapter-19.htm