贫贱是苦难的境界，能很好地居于其境者就苦中有乐；富贵是快乐的境地，不能很好地对待富贵的人便会乐极生悲。
Learning consists in the modification of certain mediating processes which operate between the stimulus and the response.
故事是我们传递人性的方式。
The best performance improvement is the transition from the nonworking state to the working state.
