生活中有黑暗也有光明，而你就是那光明中的光明。

The development of attention in childhood is a foundation for self-regulation and academic achievement.

Success is not the key to happiness. Happiness is the key to success. If you love what you are doing, you will be successful.

数学的本质不是使简单的事物复杂化，而是使复杂的事物简单化。