I would say that the meditation I've done the most is really focusing on the breath like what Roberto was talking about, but I've also done some mantra meditations and visualization... What is a mantra meditation?

我所进行过的大多数冥想,主要就是集中注意力呼吸,像罗伯顿之前所说，但我也进行曼怛罗冥想,和观想念佛。,什么是曼怛罗冥想？

普林斯顿公开课 - 人性课程节选

And so this really is the mantra of the course.

这也可能是这门课的最大意义了。

哈佛公开课 - 计算机科学课程节选