Sometimes we get sad about things and we don’t like to tell other people that we are sad about them.

永远不要让年龄成为学习或发现的障碍。

个体本身就是一个谬误。

在数学中，发现的旅程和目的地一样重要。

To say something is to perform an action， and to perform an action is to do something with words.