我不是因为快乐而唱歌，我因为唱歌而快乐。
I never buy anything unless I can give myself a good reason why I should buy it.
The community is a fictitious body， composed of the individual persons who are considered as constituting as it were its members.
Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.
A moral being is one who is capable of reflecting on his past actions and their motives.