A line from OK Computer's 7th track, Fitter Happier, the mechanized voice spouting mantras and anti-mantras of the modern age. This line has been in my head for several days, the advice given is to be practical and not overly optimistic. Why? Because as birdonmyshoulder* pointed out, idealists get hurt. How can you be happy when constantly receiving negative reinforcement as your ideals are battered and shot down again, and again?

Also, pragmatists are a lot more stable than idealists. Pragmatists are more likely to accept the status quo, for what could be more practical? Many of the platitudes from the song involve conformity to society and the protestant work ethic and being incredibly mediocre. more productive...not drinking too much...fond but not in love...no chance of escape...concerned(but powerless)...

Don't make too much noise, and we won't bother you.