You can't just add up all the pleasures and subtract the pains, or add up all the accomplishments and subtract the failures, or add up all the knowledge and subtract the ignorance and deception.

你不能只是把快乐加起来然后减去痛苦，或者仅是把成功相加再减去失败，或者把学问相加再减去蒙昧和欺骗。

耶鲁公开课 - 死亡课程节选

But then, I combine i times Ax with i times Bx, because that's the vector parallel to i, with the length Ax.

然后我把 i ? Ax 和 i ? Bx 加起来,因为这是平行于 i,模长为 Ax 的矢量

耶鲁公开课 - 基础物理课程节选