TANYA CHAPTER 38 Part Two ! Do Mindless Mitzvahs = Body without Soul! If one performs a Mitzvah without any concentration, intention or mindfulness...
TANYA CHAPTER 28: Part One "Thought Police" What to do when bad thoughts invade your divine service while Davening.
TANYA CHAPTER 17: PART ONE “For this thing is very near to you, in your mouth and in your heart, that you may do...