Class Four. It is important for everyone, even those sacrificing for others to have an aspect of introspection or all they do may become Gaava and Klipa. Page 107-8.  

Class Three. The story of the letter that went unanswered because the Frierdike Rebbe felt it had no relevance to the one asking the question in Avoda. We must do iskafia. It is equal to the ‘Chosid Sorfun’ mesiras nefesh and we cannot put one ahead of the other. Only introspection truly makes a mentsch….