Jason Shron won’t finish building the model railroad in his basement - a scaled down replica of the Toronto-Montreal route circa 1980 - until he is 95 years old. But that’s OK: for him, model railroading is a kind of spiritual practice. Brian Bachand was passionate about his work as a Catholic priest in Boston, but he made the decision to leave. Lena Felton shares expert advice on when and how to quit a book, a relationship, or a dream.