写作的行为是一种乐观的行为。如果你觉得它不重要，你就不会费心去做。

Every problem in mathematics is a puzzle waiting to be solved, and the joy is in the solving.

解释：依据自己的能力去做事，把握最佳时机采取行动。

"Sometimes, you have to look back in order to understand the things that lie ahead."

任正非内部讲话稿

音乐可以改变世界，因为它可以改变人的思想。