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Happiness is not something ready-made. It comes from your own actions.
Let’s face it, a nice creamy chocolate cake does a lot for a lot of people; it does for me.  
The only freedom which deserves the name is that of pursuing our own good in our way, so long as we do not attempt to deprive others of theirs or impede their efforts to obtain it.
数学不仅仅是关于数字、方程、计算或算法:它是关于理解的。
Happiness is not something ready made. It comes from your own actions.
The stock market is a device for transferring money from the impatient to the patient.