Just a few small points. First of all, keep in mind that the bug is probably not where you think it is. Because if a bug were there, you'd have already found it.

第一，记住错误可能不是，发生在你认为的地方,因为如果那儿有一个错误,你可能已经找到了它。

麻省理工公开课 - 计算机科学及编程导论课程节选

All change begins in the mind of single person or a small group."

所有改变从一个人或一小众人的思想开始“

哈佛公开课 - 幸福课课程节选