A good, hygienic way of doing this is, not only do I not go in and change things except through a pre-defined method, I shouldn't read it other Cartesian than through a pre-defined method.

做这个的方式是，我不仅仅要通过提前定义好的方法,来改变数值,我还应该通过提前定义好的方法，来读这个值,我应该用。

麻省理工公开课 - 计算机科学及编程导论课程节选

One of the most significant barriers to people doing things in the world, to actually introducing change is that they underestimate their ability to bring about change.

人若想在世间有所为,真正实现改变，面对的最显著障碍之一,是他们低估自己实现改变的能力。

哈佛公开课 - 幸福课课程节选