Go by the Book

Meaning:

• If you do something by the book, you do it exactly as the rules tell you.

Example sentence:

Your reputation will be discredited if you don't go by the book. If I were you, I'd follow the rules strictly.

Questions for you to answer:

1. Do you always go by the book, or do you sometimes break the rules? 
2. In which situations do you think it's necessary to go by the book? 
3. When did you last regret not going by the book? 
4. What do you think is the origin of the idiom? What 'book' does it probably refer to?