Nobody really likes to be lectured a lot. And, therefore, if you want to be an effective person, what you don't do is scold the person publicly all the time.
How did you get back?' asked Vautrin. 'I walked,' replied Eugene. 'I wouldn't like half-pleasures, myself,' observed the tempter. 'I'd want to go there in my own carriage, have my own box, and come back in comfort. All or nothing, that's my motto.' 'And a very good one,' said Madame Vauquer.
The prosecution wants to make sure the process by which the evidence was obtained is not truthfully presented, because, as often as not, that process will raise questions.