Good and bad karma are just ways of evaluating causal experience. What you do affects your attention field.
Frederick LenzSalvakalpa samadhi is absorption in eternity to the point where there is no real concept of self but there's still a karmic chain. Nirvikalpa samadhi is absorption in nirvana; concepts of self and no-self go away completely.
Frederick LenzYou can just sweep the floor generally and gain nothing from it. Or you can figure out the best way to sweep the floor, put your power into it, use it as a concentration exercise, and be meditative.
Frederick LenzOvercoming fear has nothing to do with abandoning common sense. We retain our common sense, but we lose that emotion that is fear.
Frederick Lenz