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我只希望在自己衰老前退休，否則我只會成為累贅。

Every challenge is an opportunity to learn and improve.

In mathematics, you don't understand things. You just get used to them.

The world is full of people who have stopped listening to themselves or have listened only to their neighbors to learn what they ought to do, how they ought to behave, and what the values are that they should be living by.