I'm guessing that the intent is that each person would like to be happy, but no one wants everyone to be happy.
This seems better supported by the text than my first thought, which was that people want to be happy, but are unwilling to do what is necessary to be be happy.
That's interesting, because I read it as saying that people will object to anyone imposing on them their own idea of what will make them happy. Or to clear up the pronouns, X will object to Y imposing a grand scheme of what Y thinks will make everyone including X happy.
What did the author intend, in context?
Here's the new thread for posting quotes, with the usual rules: