A painting must be beautiful in itself, not because it represents something beautiful.
The question is not how to get cured, but how to live.
The rule, or measuring rod, which the behaviorist puts in front of him always is: Can I describe this bit of behavior I see in terms of "stimulus and response"?
Innovation in energy must balance environmental responsibility with economic viability.
  选择最有用的生活方式,习惯会使其变得最令人愉悦。