Answer:
“You don’t form a habit by doing something once, he told himself as he left his boss’s office”, is one of the examples in the story that show that Juan was going to turn into a “passive” type of person that would be like, “Meh, if I do this… it will not affect me.” Also, Juan got executed because of his unregretful behavior that led to that. Evidence: “Naturally, he censored it without regret. And just as naturally, he couldn’t stop them from executing him the following morning, another victim of his devotion to his work.”< that is how his life changed because of everything he did.