It's true the net force is 0, but it doesn't mean you can ignore it.

所受的合力是 0,但是并不意味着你可以忽略它

耶鲁公开课 - 基础物理课程节选

You will find that, even if you succeed in discounting the attitudes of others to you and your life, you must wrestle with yourself most of all, fight with yourself, for there will surge up in you a strong desire to alter facts, to dress up your feelings.

你会发现，即使你可以忽略,其他人对你及你的生活的态度，你还得和自己战斗，几乎是和自己抗争，这样你就会有种强烈的欲望，要扭曲事实来添油加醋地描述你的感觉。

耶鲁公开课 - 1945年后的美国小说课程节选